diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/README.md b/lib/node_modules/@stdlib/blas/ext/find-index-between/README.md
new file mode 100644
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--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/README.md
@@ -0,0 +1,295 @@
+
+
+# findIndexBetween
+
+> Return the index of the first element along an [ndarray][@stdlib/ndarray/ctor] dimension which passes a test implemented by a predicate function within a specified range.
+
+
+
+## Usage
+
+```javascript
+var findIndexBetween = require( '@stdlib/blas/ext/find-index-between' );
+```
+
+#### findIndexBetween( x, fromIndex, toIndex\[, options], clbk\[, thisArg] )
+
+Returns the index of the first element along an [ndarray][@stdlib/ndarray/ctor] dimension which passes a test implemented by a predicate function within a specified range.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+// Create an input ndarray:
+var x = array( [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ] );
+// returns
+
+// Perform operation:
+var out = findIndexBetween( x, 1, 4, isEven );
+// returns [ 3 ]
+```
+
+The function has the following parameters:
+
+- **x**: input [ndarray][@stdlib/ndarray/ctor]. Must have at least one dimension.
+- **fromIndex**: index from which to begin searching. May be either a scalar value or an [ndarray][@stdlib/ndarray/ctor] having an integer index or "generic" [data type][@stdlib/ndarray/dtypes]. If provided an [ndarray][@stdlib/ndarray/ctor], the value must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the non-reduced dimensions of the input [ndarray][@stdlib/ndarray/ctor]. For example, given the input shape `[2, 3, 4]` and `options.dim=0`, a provided [ndarray][@stdlib/ndarray/ctor] must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape `[3, 4]`. If provided a negative integer, the index at which to begin searching along a dimension is determined by counting backward from the last element (where `-1` refers to the last element).
+- **toIndex**: index at which to stop searching (exclusive). May be either a scalar value or an [ndarray][@stdlib/ndarray/ctor] having an integer index or "generic" [data type][@stdlib/ndarray/dtypes]. If provided an [ndarray][@stdlib/ndarray/ctor], the value must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the non-reduced dimensions of the input [ndarray][@stdlib/ndarray/ctor]. For example, given the input shape `[2, 3, 4]` and `options.dim=0`, a provided [ndarray][@stdlib/ndarray/ctor] must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape `[3, 4]`. If provided a negative integer, the index at which to stop searching along a dimension is determined by counting backward from the last element (where `-1` refers to the last element).
+- **options**: function options (_optional_).
+- **clbk**: callback function.
+- **thisArg**: callback execution context (_optional_).
+
+The invoked callback is provided three arguments:
+
+- **value**: current array element.
+- **idx**: current array element index.
+- **array**: input ndarray.
+
+To set the callback execution context, provide a `thisArg`.
+
+
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ this.count += 1;
+ return v % 2.0 === 0.0;
+}
+
+var x = array( [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ] );
+
+var ctx = {
+ 'count': 0
+};
+var out = findIndexBetween( x, 1, 4, isEven, ctx );
+// returns [ 3 ]
+
+var count = ctx.count;
+// returns 3
+```
+
+The function accepts the following options:
+
+- **dtype**: output ndarray [data type][@stdlib/ndarray/dtypes]. Must be an integer index or generic [data type][@stdlib/ndarray/dtypes].
+- **dim**: dimension over which to perform operation. If provided a negative integer, the dimension along which to perform the operation is determined by counting backward from the last dimension (where `-1` refers to the last dimension). Default: `-1`.
+- **keepdims**: boolean indicating whether the reduced dimensions should be included in the returned [ndarray][@stdlib/ndarray/ctor] as singleton dimensions. Default: `false`.
+
+If no element along an [ndarray][@stdlib/ndarray/ctor] dimension passes a test implemented by the predicate function, the corresponding element in the returned [ndarray][@stdlib/ndarray/ctor] is `-1`.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+// Create an input ndarray:
+var x = array( [ 1.0, 3.0, 5.0, 7.0 ] );
+// returns
+
+// Perform operation:
+var out = findIndexBetween( x, 0, 4, isEven );
+// returns [ -1 ]
+```
+
+By default, the function performs the operation over elements in the last dimension. To perform the operation over a different dimension, provide a `dim` option.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+var x = array( [ [ -1.0, 2.0 ], [ -3.0, 4.0 ] ] );
+
+var opts = {
+ 'dim': 0
+};
+
+var out = findIndexBetween( x, 0, 2, opts, isEven );
+// returns [ -1, 0 ]
+```
+
+By default, the function excludes reduced dimensions from the output [ndarray][@stdlib/ndarray/ctor]. To include the reduced dimensions as singleton dimensions, set the `keepdims` option to `true`.
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+var x = array( [ [ -1.0, 2.0 ], [ -3.0, 4.0 ] ] );
+
+var opts = {
+ 'dim': 0,
+ 'keepdims': true
+};
+
+var out = findIndexBetween( x, 0, 2, opts, isEven );
+// returns [ [ -1, 0 ] ]
+```
+
+By default, the function returns an [ndarray][@stdlib/ndarray/ctor] having a [data type][@stdlib/ndarray/dtypes] determined by the function's output data type [policy][@stdlib/ndarray/output-dtype-policies]. To override the default behavior, set the `dtype` option.
+
+```javascript
+var dtype = require( '@stdlib/ndarray/dtype' );
+var array = require( '@stdlib/ndarray/array' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+var x = array( [ 2.0, 1.0, 3.0, 4.0 ] );
+
+var opts = {
+ 'dtype': 'generic'
+};
+
+var idx = findIndexBetween( x, 0, 4, opts, isEven );
+// returns [ 0 ]
+
+var dt = String( dtype( idx ) );
+// returns 'generic'
+```
+
+
+
+#### findIndexBetween.assign( x, fromIndex, toIndex, out\[, options], clbk\[, thisArg] )
+
+
+
+Returns the index of the first element along an [ndarray][@stdlib/ndarray/ctor] dimension which passes a test implemented by a predicate function within a specified range and assigns results to a provided output [ndarray][@stdlib/ndarray/ctor].
+
+```javascript
+var array = require( '@stdlib/ndarray/array' );
+var zeros = require( '@stdlib/ndarray/zeros' );
+
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+var x = array( [ 2.0, 1.0, 3.0, 4.0 ] );
+var y = zeros( [], {
+ 'dtype': 'int32'
+});
+
+var out = findIndexBetween.assign( x, 0, 4, y, isEven );
+// returns [ 0 ]
+
+var bool = ( out === y );
+// returns true
+```
+
+The method has the following parameters:
+
+- **x**: input [ndarray][@stdlib/ndarray/ctor]. Must have at least one dimension.
+- **fromIndex**: index from which to begin searching. May be either a scalar value or an [ndarray][@stdlib/ndarray/ctor] having an integer index or "generic" [data type][@stdlib/ndarray/dtypes]. If provided an [ndarray][@stdlib/ndarray/ctor], the value must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the non-reduced dimensions of the input [ndarray][@stdlib/ndarray/ctor]. For example, given the input shape `[2, 3, 4]` and `options.dim=0`, a provided [ndarray][@stdlib/ndarray/ctor] must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape `[3, 4]`. If provided a negative integer, the index at which to begin searching along a dimension is determined by counting backward from the last element (where `-1` refers to the last element).
+- **toIndex**: index at which to stop searching (exclusive). May be either a scalar value or an [ndarray][@stdlib/ndarray/ctor] having an integer index or "generic" [data type][@stdlib/ndarray/dtypes]. If provided an [ndarray][@stdlib/ndarray/ctor], the value must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the non-reduced dimensions of the input [ndarray][@stdlib/ndarray/ctor]. For example, given the input shape `[2, 3, 4]` and `options.dim=0`, a provided [ndarray][@stdlib/ndarray/ctor] must have a shape which is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with the shape `[3, 4]`. If provided a negative integer, the index at which to stop searching along a dimension is determined by counting backward from the last element (where `-1` refers to the last element).
+- **out**: output [ndarray][@stdlib/ndarray/ctor].
+- **options**: function options (_optional_).
+- **clbk**: callback function.
+- **thisArg**: callback execution context (_optional_).
+
+The method accepts the following options:
+
+- **dim**: dimension over which to perform operation. If provided a negative integer, the dimension along which to perform the operation is determined by counting backward from the last dimension (where `-1` refers to the last dimension). Default: `-1`.
+
+
+
+
+
+
+
+## Notes
+
+- A provided callback function should return a boolean.
+- Setting the `keepdims` option to `true` can be useful when wanting to ensure that the output [ndarray][@stdlib/ndarray/ctor] is [broadcast-compatible][@stdlib/ndarray/base/broadcast-shapes] with ndarrays having the same shape as the input [ndarray][@stdlib/ndarray/ctor].
+- The output data type [policy][@stdlib/ndarray/output-dtype-policies] only applies to the main function and specifies that, by default, the function must return an [ndarray][@stdlib/ndarray/ctor] having an integer index or "generic" [data type][@stdlib/ndarray/dtypes]. For the `assign` method, the output [ndarray][@stdlib/ndarray/ctor] is allowed to have any supported output [data type][@stdlib/ndarray/dtypes].
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var discreteUniform = require( '@stdlib/random/discrete-uniform' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var findIndexBetween = require( '@stdlib/blas/ext/find-index-between' );
+
+// Define a callback function:
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+// Generate an ndarray of random numbers:
+var x = discreteUniform( [ 5, 2 ], 0, 20, {
+ 'dtype': 'generic'
+});
+console.log( ndarray2array( x ) );
+
+var opts = {
+ 'dim': 0
+};
+
+// Perform operation:
+var idx = findIndexBetween( x, 0, 5, opts, isEven );
+
+// Print the results:
+console.log( ndarray2array( idx ) );
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/ctor
+
+[@stdlib/ndarray/dtypes]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/dtypes
+
+[@stdlib/ndarray/output-dtype-policies]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/output-dtype-policies
+
+[@stdlib/ndarray/base/broadcast-shapes]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/base/broadcast-shapes
+
+
+
+
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.assign.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.assign.js
new file mode 100644
index 000000000000..e6876689e303
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.assign.js
@@ -0,0 +1,121 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var uniform = require( '@stdlib/random/uniform' );
+var zeros = require( '@stdlib/ndarray/zeros' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var findIndexBetween = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+ 'dtype': 'float64'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Callback function.
+*
+* @private
+* @param {number} v - input value
+* @returns {boolean} result
+*/
+function clbk( v ) {
+ return v < 0.0;
+}
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+ var out;
+ var x;
+
+ x = uniform( [ len ], 0.0, 100.0, options );
+ out = zeros( [], {
+ 'dtype': 'int32'
+ });
+ return benchmark;
+
+ /**
+ * Benchmark function.
+ *
+ * @private
+ * @param {Benchmark} b - benchmark instance
+ */
+ function benchmark( b ) {
+ var o;
+ var i;
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ o = findIndexBetween.assign( x, 0, len, out, clbk );
+ if ( typeof o !== 'object' ) {
+ b.fail( 'should return an ndarray' );
+ }
+ }
+ b.toc();
+ if ( isnan( o.get() ) ) {
+ b.fail( 'should not return NaN' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+ }
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+ var len;
+ var min;
+ var max;
+ var f;
+ var i;
+
+ min = 1; // 10^min
+ max = 6; // 10^max
+
+ for ( i = min; i <= max; i++ ) {
+ len = pow( 10, i );
+ f = createBenchmark( len );
+ bench( format( '%s:assign:dtype=%s,len=%d', pkg, options.dtype, len ), f );
+ }
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.js
new file mode 100644
index 000000000000..6111bc2b82c9
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/benchmark/benchmark.js
@@ -0,0 +1,114 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var uniform = require( '@stdlib/random/uniform' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var findIndexBetween = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+ 'dtype': 'float64'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Callback function.
+*
+* @private
+* @param {number} v - input value
+* @returns {boolean} result
+*/
+function clbk( v ) {
+ return v < 0.0;
+}
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+ var x = uniform( [ len ], 0.0, 100.0, options );
+ return benchmark;
+
+ /**
+ * Benchmark function.
+ *
+ * @private
+ * @param {Benchmark} b - benchmark instance
+ */
+ function benchmark( b ) {
+ var o;
+ var i;
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ o = findIndexBetween( x, 0, len, clbk );
+ if ( typeof o !== 'object' ) {
+ b.fail( 'should return an ndarray' );
+ }
+ }
+ b.toc();
+ if ( isnan( o.get() ) ) {
+ b.fail( 'should not return NaN' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+ }
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+ var len;
+ var min;
+ var max;
+ var f;
+ var i;
+
+ min = 1; // 10^min
+ max = 6; // 10^max
+
+ for ( i = min; i <= max; i++ ) {
+ len = pow( 10, i );
+ f = createBenchmark( len );
+ bench( format( '%s:dtype=%s,len=%d', pkg, options.dtype, len ), f );
+ }
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/repl.txt b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/repl.txt
new file mode 100644
index 000000000000..d6eeabfd458d
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/repl.txt
@@ -0,0 +1,159 @@
+
+{{alias}}( x, fromIndex, toIndex[, options], clbk[, thisArg] )
+ Returns the index of the first element along an ndarray dimension which
+ passes a test implemented by a predicate function within a specified range.
+
+ The callback function is provided the following arguments:
+
+ - value: current array element.
+ - index: current array index.
+ - array: the input ndarray.
+
+ The callback function should return a boolean.
+
+ If no element along an ndarray dimension passes a test implemented by the
+ predicate function, the corresponding element in the returned ndarray is
+ `-1`.
+
+ Parameters
+ ----------
+ x: ndarray
+ Input array. Must have at least one dimension.
+
+ fromIndex: ndarray|integer
+ Index from which to begin searching. May be either a scalar value or an
+ ndarray having an integer or "generic" data type. If provided an
+ ndarray, the value must have a shape which is broadcast compatible with
+ the non-reduced dimensions of the input ndarray. For example, given the
+ input shape `[2, 3, 4]` and `options.dim=0`, a provided ndarray must
+ have a shape which is broadcast-compatible with the shape `[3, 4]`. If
+ provided a negative integer, the index at which to begin searching along
+ a dimension is determined by counting backward from the last element
+ (where -1 refers to the last element).
+
+ toIndex: ndarray|integer
+ Index at which to stop searching (exclusive). May be either a scalar
+ value or an ndarray having an integer or "generic" data type. If
+ provided an ndarray, the value must have a shape which is broadcast
+ compatible with the non-reduced dimensions of the input ndarray. For
+ example, given the input shape `[2, 3, 4]` and `options.dim=0`, a
+ provided ndarray must have a shape which is broadcast-compatible with
+ the shape `[3, 4]`. If provided a negative integer, the index at which
+ to stop searching along a dimension is determined by counting backward
+ from the last element (where -1 refers to the last element).
+
+ options: Object (optional)
+ Function options.
+
+ options.dtype: string|DataType (optional)
+ Output array data type. Must be an integer index or "generic" data type.
+
+ options.dim: integer (optional)
+ Dimension over which to perform a reduction. If provided a negative
+ integer, the dimension along which to perform the operation is
+ determined by counting backward from the last dimension (where -1 refers
+ to the last dimension). Default: -1.
+
+ options.keepdims: boolean (optional)
+ Boolean indicating whether the reduced dimensions should be included in
+ the returned ndarray as singleton dimensions. Default: false.
+
+ clbk: Function
+ Callback function.
+
+ thisArg: any (optional)
+ Callback execution context.
+
+ Returns
+ -------
+ out: ndarray
+ Output array.
+
+ Examples
+ --------
+ > var x = {{alias:@stdlib/ndarray/array}}( [ -1.0, 2.0, -3.0, -4.0 ] );
+ > function clbk( v ) { return v % 2.0 === 0.0; };
+ > var y = {{alias}}( x, 0, 4, clbk )
+ [ 1 ]
+
+
+{{alias}}.assign( x, fromIndex, toIndex, out[, options], clbk[, thisArg] )
+ Returns the index of the first element along an ndarray dimension which
+ passes a test implemented by a predicate function within a specified range
+ and assigns results to a provided output ndarray.
+
+ The callback function is provided the following arguments:
+
+ - value: current array element.
+ - index: current array index.
+ - array: the input ndarray.
+
+ The callback function should return a boolean.
+
+ If no element along an ndarray dimension passes a test implemented by the
+ predicate function, the corresponding element in the returned ndarray is
+ `-1`.
+
+ Parameters
+ ----------
+ x: ndarray
+ Input array. Must have at least one dimension.
+
+ fromIndex: ndarray|integer
+ Index from which to begin searching. May be either a scalar value or an
+ ndarray having an integer or "generic" data type. If provided an
+ ndarray, the value must have a shape which is broadcast compatible with
+ the non-reduced dimensions of the input ndarray. For example, given the
+ input shape `[2, 3, 4]` and `options.dim=0`, a provided ndarray must
+ have a shape which is broadcast-compatible with the shape `[3, 4]`. If
+ provided a negative integer, the index at which to begin searching along
+ a dimension is determined by counting backward from the last element
+ (where -1 refers to the last element).
+
+ toIndex: ndarray|integer
+ Index at which to stop searching (exclusive). May be either a scalar
+ value or an ndarray having an integer or "generic" data type. If
+ provided an ndarray, the value must have a shape which is broadcast
+ compatible with the non-reduced dimensions of the input ndarray. For
+ example, given the input shape `[2, 3, 4]` and `options.dim=0`, a
+ provided ndarray must have a shape which is broadcast-compatible with
+ the shape `[3, 4]`. If provided a negative integer, the index at which
+ to stop searching along a dimension is determined by counting backward
+ from the last element (where -1 refers to the last element).
+
+ out: ndarray
+ Output array.
+
+ options: Object (optional)
+ Function options.
+
+ options.dim: integer (optional)
+ Dimension over which to perform a reduction. If provided a negative
+ integer, the dimension along which to perform the operation is
+ determined by counting backward from the last dimension (where -1 refers
+ to the last dimension). Default: -1.
+
+ clbk: Function
+ Callback function.
+
+ thisArg: any (optional)
+ Callback execution context.
+
+ Returns
+ -------
+ out: ndarray
+ Output array.
+
+ Examples
+ --------
+ > var x = {{alias:@stdlib/ndarray/array}}( [ -1.0, 2.0, -3.0, -4.0 ] );
+ > var out = {{alias:@stdlib/ndarray/zeros}}( [], { 'dtype': 'int32' } );
+ > function clbk( v ) { return v % 2.0 === 0.0; };
+ > var y = {{alias}}.assign( x, 0, 4, out, clbk )
+ [ 1 ]
+ > var bool = ( out === y )
+ true
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/index.d.ts b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/index.d.ts
new file mode 100644
index 000000000000..a72e254d6d24
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/index.d.ts
@@ -0,0 +1,293 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+///
+
+import { IntegerIndexAndGenericDataType as DataType, typedndarray } from '@stdlib/types/ndarray';
+
+/**
+* Input array.
+*/
+type InputArray = typedndarray;
+
+/**
+* Index argument.
+*/
+type IndexArg = typedndarray | number;
+
+/**
+* Output array.
+*/
+type OutputArray = typedndarray;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @returns boolean indicating whether an element passes a test
+*/
+type NullaryPredicate = ( this: ThisArg ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @returns boolean indicating whether an element passes a test
+*/
+type UnaryPredicate = ( this: ThisArg, value: T ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @returns boolean indicating whether an element passes a test
+*/
+type BinaryPredicate = ( this: ThisArg, value: T, index: number ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @param array - input ndarray
+* @returns boolean indicating whether an element passes a test
+*/
+type TernaryPredicate = ( this: ThisArg, value: T, index: number, array: U ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @param array - input ndarray
+* @returns boolean indicating whether an element passes a test
+*/
+type Predicate = NullaryPredicate | UnaryPredicate | BinaryPredicate | TernaryPredicate;
+
+/**
+* Interface defining "base" options.
+*/
+interface BaseOptions {
+ /**
+ * Dimension over which to perform operation. Default: `-1`.
+ *
+ * ## Notes
+ *
+ * - If provided a negative integer, the dimension along which to perform the operation is determined by counting backward from the last dimension (where `-1` refers to the last dimension).
+ */
+ dim?: number;
+}
+
+/**
+* Interface defining options.
+*/
+interface Options extends BaseOptions {
+ /**
+ * Output array data type.
+ */
+ dtype?: DataType;
+
+ /**
+ * Boolean indicating whether the reduced dimensions should be included in the returned array as singleton dimensions. Default: `false`.
+ */
+ keepdims?: boolean;
+}
+
+/**
+* Interface describing `findIndexBetween`.
+*/
+interface FindIndexBetween {
+ /**
+ * Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+ *
+ * ## Notes
+ *
+ * - If no element along an ndarray dimension passes a test implemented by the predicate function, the corresponding element in the returned ndarray is `-1`.
+ *
+ * @param x - input ndarray
+ * @param fromIndex - index from which to begin searching
+ * @param toIndex - index at which to stop searching (exclusive)
+ * @param clbk - predicate function
+ * @param thisArg - predicate function execution context
+ * @returns output ndarray
+ *
+ * @example
+ * var array = require( '@stdlib/ndarray/array' );
+ *
+ * function clbk( value ) {
+ * return value % 2.0 === 0.0;
+ * }
+ *
+ * var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+ *
+ * var y = findIndexBetween( x, 1, 4, clbk );
+ * // returns [ 3 ]
+ */
+ = InputArray, ThisArg = unknown>( x: U, fromIndex: IndexArg, toIndex: IndexArg, clbk: Predicate, thisArg?: ThisParameterType> ): OutputArray;
+
+ /**
+ * Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+ *
+ * ## Notes
+ *
+ * - If no element along an ndarray dimension passes a test implemented by the predicate function, the corresponding element in the returned ndarray is `-1`.
+ *
+ * @param x - input ndarray
+ * @param fromIndex - index from which to begin searching
+ * @param toIndex - index at which to stop searching (exclusive)
+ * @param options - function options
+ * @param clbk - predicate function
+ * @param thisArg - predicate function execution context
+ * @returns output ndarray
+ *
+ * @example
+ * var array = require( '@stdlib/ndarray/array' );
+ *
+ * function clbk( value ) {
+ * return value % 2.0 === 0.0;
+ * }
+ *
+ * var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+ *
+ * var y = findIndexBetween( x, 1, 4, {}, clbk );
+ * // returns [ 3 ]
+ */
+ = InputArray, ThisArg = unknown>( x: U, fromIndex: IndexArg, toIndex: IndexArg, options: Options, clbk: Predicate, thisArg?: ThisParameterType> ): OutputArray;
+
+ /**
+ * Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range and assigns results to a provided output ndarray.
+ *
+ * ## Notes
+ *
+ * - If no element along an ndarray dimension passes a test implemented by the predicate function, the corresponding element in the returned ndarray is `-1`.
+ *
+ * @param x - input ndarray
+ * @param fromIndex - index from which to begin searching
+ * @param toIndex - index at which to stop searching (exclusive)
+ * @param out - output ndarray
+ * @param clbk - predicate function
+ * @param thisArg - predicate function execution context
+ * @returns output ndarray
+ *
+ * @example
+ * var array = require( '@stdlib/ndarray/array' );
+ * var zeros = require( '@stdlib/ndarray/zeros' );
+ *
+ * function clbk( value ) {
+ * return value % 2.0 === 0.0;
+ * }
+ *
+ * var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+ * var y = zeros( [] );
+ *
+ * var out = findIndexBetween.assign( x, 1, 4, y, clbk );
+ * // returns [ 3 ]
+ *
+ * var bool = ( out === y );
+ * // returns true
+ */
+ assign = InputArray, V extends OutputArray = OutputArray, ThisArg = unknown>( x: U, fromIndex: IndexArg, toIndex: IndexArg, out: V, clbk: Predicate, thisArg?: ThisParameterType> ): V;
+
+ /**
+ * Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range and assigns results to a provided output ndarray.
+ *
+ * ## Notes
+ *
+ * - If no element along an ndarray dimension passes a test implemented by the predicate function, the corresponding element in the returned ndarray is `-1`.
+ *
+ * @param x - input ndarray
+ * @param fromIndex - index from which to begin searching
+ * @param toIndex - index at which to stop searching (exclusive)
+ * @param out - output ndarray
+ * @param options - function options
+ * @param clbk - predicate function
+ * @param thisArg - predicate function execution context
+ * @returns output ndarray
+ *
+ * @example
+ * var array = require( '@stdlib/ndarray/array' );
+ * var zeros = require( '@stdlib/ndarray/zeros' );
+ *
+ * function clbk( value ) {
+ * return value % 2.0 === 0.0;
+ * }
+ *
+ * var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+ * var y = zeros( [] );
+ *
+ * var out = findIndexBetween.assign( x, 1, 4, y, {}, clbk );
+ * // returns [ 3 ]
+ *
+ * var bool = ( out === y );
+ * // returns true
+ */
+ assign = InputArray, V extends OutputArray = OutputArray, ThisArg = unknown>( x: U, fromIndex: IndexArg, toIndex: IndexArg, out: V, options: BaseOptions, clbk: Predicate, thisArg?: ThisParameterType> ): V;
+}
+
+/**
+* Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+*
+* ## Notes
+*
+* - If no element along an ndarray dimension passes a test implemented by the predicate function, the corresponding element in the returned ndarray is `-1`.
+*
+* @param x - input ndarray
+* @param fromIndex - index from which to begin searching
+* @param toIndex - index at which to stop searching (exclusive)
+* @param options - function options
+* @param clbk - predicate function
+* @param thisArg - predicate function execution context
+* @returns output ndarray
+*
+* @example
+* var array = require( '@stdlib/ndarray/array' );
+*
+* function clbk( value ) {
+* return value % 2.0 === 0.0;
+* }
+*
+* var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+*
+* var y = findIndexBetween( x, 1, 4, clbk );
+* // returns [ 3 ]
+*
+* @example
+* var array = require( '@stdlib/ndarray/array' );
+* var zeros = require( '@stdlib/ndarray/zeros' );
+*
+* function clbk( value ) {
+* return value % 2.0 === 0.0;
+* }
+*
+* var x = array( [ 2.0, 1.0, -3.0, 4.0 ] );
+* var y = zeros( [] );
+*
+* var out = findIndexBetween.assign( x, 1, 4, y, clbk );
+* // returns [ 3 ]
+*
+* var bool = ( out === y );
+* // returns true
+*/
+declare const findIndexBetween: FindIndexBetween;
+
+
+// EXPORTS //
+
+export = findIndexBetween;
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/test.ts b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/test.ts
new file mode 100644
index 000000000000..52106ee790ed
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/docs/types/test.ts
@@ -0,0 +1,470 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* eslint-disable @typescript-eslint/no-unused-expressions, space-in-parens */
+
+///
+
+import zeros = require( '@stdlib/ndarray/zeros' );
+import findIndexBetween = require( './index' );
+
+/**
+* Callback function.
+*
+* @param value - ndarray element
+* @returns result
+*/
+function clbk( value: any ): boolean {
+ return value % 2.0 === 0.0;
+}
+
+
+// TESTS //
+
+// The function returns an ndarray...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, clbk ); // $ExpectType OutputArray
+ findIndexBetween( x, 0, 2, clbk, {} ); // $ExpectType OutputArray
+
+ findIndexBetween( x, 0, 2, {}, clbk ); // $ExpectType OutputArray
+ findIndexBetween( x, 0, 2, {}, clbk, {} ); // $ExpectType OutputArray
+}
+
+// The compiler throws an error if the function is provided a first argument which is not an ndarray...
+{
+ findIndexBetween( '5', 0, 2, clbk ); // $ExpectError
+ findIndexBetween( 5, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( true, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( false, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( null, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( void 0, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( {}, 0, 2, clbk ); // $ExpectError
+ findIndexBetween( ( x: number ): number => x, 0, 2, clbk ); // $ExpectError
+
+ findIndexBetween( '5', 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( 5, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( true, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( false, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( null, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( void 0, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( {}, 0, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( ( x: number ): number => x, 0, 2, clbk, {} ); // $ExpectError
+
+ findIndexBetween( '5', 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( 5, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( true, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( false, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( null, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( void 0, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( {}, 0, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( ( x: number ): number => x, 0, 2, {}, clbk ); // $ExpectError
+
+ findIndexBetween( '5', 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( 5, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( true, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( false, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( null, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( void 0, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( {}, 0, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( ( x: number ): number => x, 0, 2, {}, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a `fromIndex` argument which is not an ndarray or an integer value...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, '5', 2, clbk ); // $ExpectError
+ findIndexBetween( x, true, 2, clbk ); // $ExpectError
+ findIndexBetween( x, false, 2, clbk ); // $ExpectError
+ findIndexBetween( x, null, 2, clbk ); // $ExpectError
+ findIndexBetween( x, [], 2, clbk ); // $ExpectError
+
+ findIndexBetween( x, '5', 2, clbk, {} ); // $ExpectError
+ findIndexBetween( x, true, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( x, false, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( x, null, 2, clbk, {} ); // $ExpectError
+ findIndexBetween( x, [], 2, clbk, {} ); // $ExpectError
+
+ findIndexBetween( x, '5', 2, {}, clbk ); // $ExpectError
+ findIndexBetween( x, true, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( x, false, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( x, null, 2, {}, clbk ); // $ExpectError
+ findIndexBetween( x, [], 2, {}, clbk ); // $ExpectError
+
+ findIndexBetween( x, '5', 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, true, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, false, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, null, 2, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, [], 2, {}, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a `toIndex` argument which is not an ndarray or an integer value...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, '5', clbk ); // $ExpectError
+ findIndexBetween( x, 0, true, clbk ); // $ExpectError
+ findIndexBetween( x, 0, false, clbk ); // $ExpectError
+ findIndexBetween( x, 0, null, clbk ); // $ExpectError
+ findIndexBetween( x, 0, [], clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, '5', clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, true, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, false, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, null, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, [], clbk, {} ); // $ExpectError
+
+ findIndexBetween( x, 0, '5', {}, clbk ); // $ExpectError
+ findIndexBetween( x, 0, true, {}, clbk ); // $ExpectError
+ findIndexBetween( x, 0, false, {}, clbk ); // $ExpectError
+ findIndexBetween( x, 0, null, {}, clbk ); // $ExpectError
+ findIndexBetween( x, 0, [], {}, clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, '5', {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, true, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, false, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, null, {}, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, [], {}, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an options argument which is not an object...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, '5', clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, true, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, false, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, null, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, [], clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, '5', clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, true, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, false, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, null, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, [], clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a callback argument which is not a function...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, '5' ); // $ExpectError
+ findIndexBetween( x, 0, 2, true ); // $ExpectError
+ findIndexBetween( x, 0, 2, false ); // $ExpectError
+ findIndexBetween( x, 0, 2, null ); // $ExpectError
+ findIndexBetween( x, 0, 2, [] ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, '5', {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, true, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, false, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, null, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, [], {} ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, {}, '5', {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, {}, true, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, {}, false, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, {}, null, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, {}, [], {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an invalid `dtype` option...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, { 'dtype': '5' }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': 5 }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': true }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': false }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': null }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': [] }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': {} }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': ( x: number ): number => x }, clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, { 'dtype': '5' }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': 5 }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': true }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': false }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': null }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': [] }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': {} }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dtype': ( x: number ): number => x }, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an invalid `keepdims` option...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, { 'keepdims': '5' }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': 5 }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': null }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': [] }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': {} }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': ( x: number ): number => x }, clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, { 'keepdims': '5' }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': 5 }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': null }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': [] }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': {} }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'keepdims': ( x: number ): number => x }, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an invalid `dim` option...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween( x, 0, 2, { 'dim': '5' }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': true }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': false }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': null }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': {} }, clbk ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': ( x: number ): number => x }, clbk ); // $ExpectError
+
+ findIndexBetween( x, 0, 2, { 'dim': '5' }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': true }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': false }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': null }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': {} }, clbk, {} ); // $ExpectError
+ findIndexBetween( x, 0, 2, { 'dim': ( x: number ): number => x }, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween(); // $ExpectError
+ findIndexBetween( x );
+ findIndexBetween( x, 0 );
+ findIndexBetween( x, 0, 2 );
+ findIndexBetween( x, 0, 2, {}, clbk, {}, {} ); // $ExpectError
+}
+
+// Attached to the function is an `assign` method which returns an ndarray...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign( x, 0, 2, y, clbk ); // $ExpectType int32ndarray
+ findIndexBetween.assign( x, 0, 2, y, {}, clbk ); // $ExpectType int32ndarray
+
+ findIndexBetween.assign( x, 0, 2, y, clbk, {} ); // $ExpectType int32ndarray
+ findIndexBetween.assign( x, 0, 2, y, {}, clbk, {} ); // $ExpectType int32ndarray
+}
+
+// The compiler throws an error if the `assign` method is provided a first argument which is not an ndarray...
+{
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign( '5', 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( 5, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( true, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( false, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( null, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( void 0, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( {}, 0, 2, y, clbk ); // $ExpectError
+ findIndexBetween.assign( ( x: number ): number => x, 0, 2, y, clbk ); // $ExpectError
+
+ findIndexBetween.assign( '5', 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( 5, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( true, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( false, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( null, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( void 0, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( {}, 0, 2, y, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( ( x: number ): number => x, 0, 2, y, {}, clbk ); // $ExpectError
+
+ findIndexBetween.assign( '5', 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( 5, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( true, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( false, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( null, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( void 0, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( {}, 0, 2, y, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( ( x: number ): number => x, 0, 2, y, clbk, {} ); // $ExpectError
+
+ findIndexBetween.assign( '5', 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( 5, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( true, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( false, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( null, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( void 0, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( {}, 0, 2, y, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( ( x: number ): number => x, 0, 2, y, {}, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the `assign` method is provided a fourth argument which is not an ndarray...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ findIndexBetween.assign( x, 0, 2, '5', clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, 5, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, true, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, false, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, null, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, void 0, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, ( x: number ): number => x, clbk ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, '5', {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, 5, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, true, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, false, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, null, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, void 0, {}, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, ( x: number ): number => x, {}, clbk ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, '5', clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, 5, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, true, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, false, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, null, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, void 0, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, ( x: number ): number => x, clbk, {} ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, '5', {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, 5, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, true, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, false, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, null, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, void 0, {}, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, ( x: number ): number => x, {}, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the `assign` method is provided an options argument which is not an object...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign( x, 0, 2, y, '5', clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, true, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, false, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, null, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, [], clbk ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, y, '5', clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, true, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, false, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, null, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, [], clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the `assign` method is provided a callback argument which is not a function...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign( x, 0, 2, y, '5' ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, true ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, false ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, null ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, [] ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, y, '5', {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, true, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, false, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, null, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, [], {} ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, y, {}, '5' ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, true ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, false ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, null ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, [] ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, y, {}, '5', {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, true, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, false, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, null, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, [], {} ); // $ExpectError
+}
+
+// The compiler throws an error if the `assign` method is provided an invalid `dim` option...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': '5' }, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': true }, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': false }, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': null }, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': {} }, clbk ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': ( x: number ): number => x }, clbk ); // $ExpectError
+
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': '5' }, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': true }, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': false }, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': null }, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': {} }, clbk, {} ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, { 'dim': ( x: number ): number => x }, clbk, {} ); // $ExpectError
+}
+
+// The compiler throws an error if the `assign` method is provided an unsupported number of arguments...
+{
+ const x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ const y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ findIndexBetween.assign(); // $ExpectError
+ findIndexBetween.assign( x ); // $ExpectError
+ findIndexBetween.assign( x, 0 ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2 ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y ); // $ExpectError
+ findIndexBetween.assign( x, 0, 2, y, {}, clbk, {}, {} ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/examples/index.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/examples/index.js
new file mode 100644
index 000000000000..31752e948b87
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/examples/index.js
@@ -0,0 +1,44 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var discreteUniform = require( '@stdlib/random/discrete-uniform' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var findIndexBetween = require( './../lib' );
+
+// Define a callback function:
+function isEven( v ) {
+ return v % 2.0 === 0.0;
+}
+
+// Generate an ndarray of random numbers:
+var x = discreteUniform( [ 5, 2 ], 0, 20, {
+ 'dtype': 'generic'
+});
+console.log( ndarray2array( x ) );
+
+var opts = {
+ 'dim': 0
+};
+
+// Perform operation:
+var idx = findIndexBetween( x, 0, 5, opts, isEven );
+
+// Print the results:
+console.log( ndarray2array( idx ) );
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/assign.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/assign.js
new file mode 100644
index 000000000000..8e0f18956f3b
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/assign.js
@@ -0,0 +1,190 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isFunction = require( '@stdlib/assert/is-function' );
+var isPlainObject = require( '@stdlib/assert/is-plain-object' );
+var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
+var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var nonCoreShape = require( '@stdlib/ndarray/base/complement-shape' );
+var getShape = require( '@stdlib/ndarray/shape' );
+var getOrder = require( '@stdlib/ndarray/order' );
+var ndims = require( '@stdlib/ndarray/ndims' );
+var format = require( '@stdlib/string/format' );
+var broadcastIndex = require( './broadcast_index.js' );
+var base = require( './base.js' ).assign;
+
+
+// MAIN //
+
+/**
+* Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range and assigns the results to a provided output ndarray.
+*
+* @param {ndarrayLike} x - input ndarray
+* @param {(ndarrayLike|integer)} fromIndex - index from which to begin searching
+* @param {(ndarrayLike|integer)} toIndex - index at which to stop searching (exclusive)
+* @param {ndarrayLike} out - output ndarray
+* @param {Options} [options] - function options
+* @param {integer} [options.dim=-1] - dimension over which to perform operation
+* @param {Function} clbk - callback function
+* @param {*} [thisArg] - callback execution context
+* @throws {TypeError} first argument must be an ndarray-like object
+* @throws {TypeError} `fromIndex` argument must be either an ndarray-like object or an integer
+* @throws {TypeError} `toIndex` argument must be either an ndarray-like object or an integer
+* @throws {TypeError} output argument must be an ndarray-like object
+* @throws {TypeError} callback argument must be a function
+* @throws {TypeError} options argument must be an object
+* @throws {RangeError} dimension index must not exceed input ndarray bounds
+* @throws {RangeError} first argument must have at least one dimension
+* @throws {Error} must provide valid options
+* @returns {ndarray} output ndarray
+*
+* @example
+* var zeros = require( '@stdlib/ndarray/zeros' );
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+*
+* function isEven( v ) {
+* return v % 2.0 === 0.0;
+* }
+*
+* // Create data buffers:
+* var xbuf = [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ];
+*
+* // Define the shape of the input array:
+* var shape = [ 6 ];
+*
+* // Define the array strides:
+* var strides = [ 1 ];
+*
+* // Define the index offset:
+* var offset = 0;
+*
+* // Create an input ndarray:
+* var x = new ndarray( 'generic', xbuf, shape, strides, offset, 'row-major' );
+*
+* // Create an output ndarray:
+* var y = zeros( [], {
+* 'dtype': 'int32'
+* });
+*
+* // Perform operation:
+* var out = assign( x, 1, 4, y, isEven );
+* // returns [ 3 ]
+*
+* var bool = ( out === y );
+* // returns true
+*/
+function assign( x, fromIndex, toIndex, out ) {
+ var hasOptions;
+ var options;
+ var nargs;
+ var opts;
+ var ord;
+ var ctx;
+ var sh;
+ var cb;
+ var o;
+
+ nargs = arguments.length;
+ if ( !isndarrayLike( x ) ) {
+ throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
+ }
+ if ( !isInteger( fromIndex ) && !isndarrayLike( fromIndex ) ) {
+ throw new TypeError( format( 'invalid argument. Second argument must be either an ndarray or an integer. Value: `%s`.', fromIndex ) );
+ }
+ if ( !isInteger( toIndex ) && !isndarrayLike( toIndex ) ) {
+ throw new TypeError( format( 'invalid argument. Third argument must be either an ndarray or an integer. Value: `%s`.', toIndex ) );
+ }
+ // Resolve input ndarray meta data:
+ ord = getOrder( x );
+
+ // Initialize an options object:
+ opts = {
+ 'dims': [ -1 ] // default behavior is to perform a reduction over the last dimension
+ };
+
+ // Initialize a flag indicating whether an `options` argument was provided:
+ hasOptions = false;
+
+ o = out;
+ if ( !isndarrayLike( o ) ) {
+ throw new TypeError( format( 'invalid argument. Fourth argument must be an ndarray. Value: `%s`.', o ) );
+ }
+
+ // Case: assign( x, fromIndex, toIndex, out, clbk )
+ if ( nargs === 5 ) {
+ cb = arguments[ 4 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Fifth argument must be a function. Value: `%s`.', cb ) );
+ }
+ }
+ // Case: assign( x, fromIndex, toIndex, out, ???, ??? )
+ else if ( nargs === 6 ) {
+ // Case: assign( x, fromIndex, toIndex, out, clbk, thisArg )
+ if ( isFunction( arguments[ 4 ] ) ) {
+ cb = arguments[ 4 ];
+ ctx = arguments[ 5 ];
+ }
+ // Case: assign( x, fromIndex, toIndex, out, options, clbk )
+ else {
+ options = arguments[ 4 ];
+ hasOptions = true;
+ cb = arguments[ 5 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Sixth argument must be a function. Value: `%s`.', cb ) );
+ }
+ }
+ }
+ // Case: assign( x, fromIndex, toIndex, out, options, clbk, thisArg )
+ else {
+ options = arguments[ 4 ];
+ hasOptions = true;
+ cb = arguments[ 5 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Sixth argument must be a function. Value: `%s`.', cb ) );
+ }
+ ctx = arguments[ 6 ];
+ }
+ if ( hasOptions ) {
+ if ( !isPlainObject( options ) ) {
+ throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+ }
+ // Resolve provided options...
+ if ( hasOwnProp( options, 'dim' ) ) {
+ opts.dims[ 0 ] = options.dim;
+ }
+ }
+ if ( ndims( x ) < 1 ) {
+ throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
+ }
+ // Resolve the list of non-reduced dimensions:
+ sh = getShape( x );
+ sh = nonCoreShape( sh, opts.dims );
+
+ // Broadcast the indices to match the shape of the non-reduced dimensions...
+ return base( x, broadcastIndex( fromIndex, sh, ord ), broadcastIndex( toIndex, sh, ord ), o, opts, cb, ctx ); // eslint-disable-line max-len
+}
+
+
+// EXPORTS //
+
+module.exports = assign;
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/base.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/base.js
new file mode 100644
index 000000000000..61fcabbab6b2
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/base.js
@@ -0,0 +1,110 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var dtypes = require( '@stdlib/ndarray/dtypes' );
+var gfindIndexBetween = require( '@stdlib/blas/ext/base/ndarray/gfind-index-between' );
+var factory = require( '@stdlib/ndarray/base/unary-reduce-strided1d-dispatch-by-factory' );
+
+
+// VARIABLES //
+
+var idtypes0 = dtypes( 'all' ); // input ndarray
+var idtypes1 = dtypes( 'integer_index_and_generic' ); // from index ndarray
+var idtypes2 = dtypes( 'integer_index_and_generic' ); // to index ndarray
+var odtypes = dtypes( 'integer_index_and_generic' );
+var policies = {
+ 'output': 'integer_index_and_generic',
+ 'casting': 'none'
+};
+var table = {
+ 'default': gfindIndexBetween
+};
+
+
+// MAIN //
+
+/**
+* Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+*
+* @private
+* @name findIndexBetween
+* @type {Function}
+* @param {ndarrayLike} x - input ndarray
+* @param {ndarrayLike} fromIndex - indices from which to begin searching
+* @param {ndarrayLike} toIndex - indices at which to stop searching (exclusive)
+* @param {Options} [options] - function options
+* @param {IntegerArray} [options.dims] - list of dimensions over which to perform operation
+* @param {*} [options.dtype] - output ndarray data type
+* @param {Function} clbk - callback function
+* @param {*} [thisArg] - callback execution context
+* @throws {TypeError} first argument must be an ndarray-like object
+* @throws {TypeError} second argument must be an ndarray-like object
+* @throws {TypeError} third argument must be an ndarray-like object
+* @throws {TypeError} options argument must be an object
+* @throws {RangeError} dimension indices must not exceed input ndarray bounds
+* @throws {RangeError} number of dimension indices must not exceed the number of input ndarray dimensions
+* @throws {Error} must provide valid options
+* @returns {ndarray} output ndarray
+*
+* @example
+* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+*
+* function isEven( v ) {
+* return v % 2.0 === 0.0;
+* }
+*
+* // Create a data buffer:
+* var xbuf = [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ];
+*
+* // Define the shape of the input array:
+* var sh = [ 6 ];
+*
+* // Define the array strides:
+* var sx = [ 1 ];
+*
+* // Define the index offset:
+* var ox = 0;
+*
+* // Create an input ndarray:
+* var x = new ndarray( 'generic', xbuf, sh, sx, ox, 'row-major' );
+*
+* // Create from and to index ndarrays:
+* var fromIndex = scalar2ndarray( 1, {
+* 'dtype': 'int32'
+* });
+* var toIndex = scalar2ndarray( 4, {
+* 'dtype': 'int32'
+* });
+*
+* // Perform operation:
+* var out = findIndexBetween( x, fromIndex, toIndex, isEven );
+* // returns [ 3 ]
+*/
+var findIndexBetween = factory( table, [ idtypes0, idtypes1, idtypes2 ], odtypes, policies );
+
+
+// EXPORTS //
+
+module.exports = findIndexBetween;
+
+// exports: { "assign": "findIndexBetween.assign" }
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/broadcast_index.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/broadcast_index.js
new file mode 100644
index 000000000000..bade251f2423
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/broadcast_index.js
@@ -0,0 +1,56 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
+var broadcastScalar = require( '@stdlib/ndarray/base/broadcast-scalar' );
+var maybeBroadcastArray = require( '@stdlib/ndarray/base/maybe-broadcast-array' );
+var getDefault = require( '@stdlib/ndarray/defaults' ).get;
+
+
+// VARIABLES //
+
+var DEFAULT_DTYPE = getDefault( 'dtypes.integer_index' );
+
+
+// MAIN //
+
+/**
+* Broadcasts an index argument to match the shape of the non-core dimensions.
+*
+* @private
+* @param {(ndarray|NonNegativeInteger)} idx - index argument
+* @param {NonNegativeIntegerArray} shape - shape of the non-core dimensions
+* @param {string} order - memory layout order
+* @returns {ndarray} ndarray containing index values
+*/
+function broadcastIndex( idx, shape, order ) {
+ // FIXME: this breaks for large integer/array sizes (e.g., casting idx > 2^32 to int32). We also need to update in the future to accommodate 64-bit integer values.
+ if ( isInteger( idx ) ) {
+ return broadcastScalar( idx, DEFAULT_DTYPE, shape, order );
+ }
+ return maybeBroadcastArray( idx, shape );
+}
+
+
+// EXPORTS //
+
+module.exports = broadcastIndex;
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/index.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/index.js
new file mode 100644
index 000000000000..aed6703f966e
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/index.js
@@ -0,0 +1,97 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Return the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+*
+* @module @stdlib/blas/ext/find-index-between
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+* var findIndexBetween = require( '@stdlib/blas/ext/find-index-between' );
+*
+* function isEven( v ) {
+* return v % 2.0 === 0.0;
+* }
+*
+* // Create a data buffer:
+* var xbuf = [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ];
+*
+* // Define the shape of the input array:
+* var sh = [ 6 ];
+*
+* // Define the array strides:
+* var sx = [ 1 ];
+*
+* // Define the index offset:
+* var ox = 0;
+*
+* // Create an input ndarray:
+* var x = new ndarray( 'generic', xbuf, sh, sx, ox, 'row-major' );
+*
+* // Perform operation:
+* var out = findIndexBetween( x, 1, 4, isEven );
+* // returns [ 3 ]
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+* var findIndexBetween = require( '@stdlib/blas/ext/find-index-between' );
+*
+* function isEven( v ) {
+* return v % 2.0 === 0.0;
+* }
+*
+* // Create a data buffer:
+* var xbuf = [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ];
+*
+* // Define the shape of the input array:
+* var sh = [ 2, 3 ];
+*
+* // Define the array strides:
+* var sx = [ 3, 1 ];
+*
+* // Define the index offset:
+* var ox = 0;
+*
+* // Create an input ndarray:
+* var x = new ndarray( 'generic', xbuf, sh, sx, ox, 'row-major' );
+*
+* // Perform operation:
+* var out = findIndexBetween( x, 0, 2, isEven );
+* // returns [ 0, 0 ]
+*/
+
+// MODULES //
+
+var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var main = require( './main.js' );
+var assign = require( './assign.js' );
+
+
+// MAIN //
+
+setReadOnly( main, 'assign', assign );
+
+
+// EXPORTS //
+
+module.exports = main;
+
+// exports: { "assign": "main.assign" }
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/main.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/main.js
new file mode 100644
index 000000000000..f9748a46a399
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/lib/main.js
@@ -0,0 +1,182 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isFunction = require( '@stdlib/assert/is-function' );
+var isPlainObject = require( '@stdlib/assert/is-plain-object' );
+var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
+var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var nonCoreShape = require( '@stdlib/ndarray/base/complement-shape' );
+var getShape = require( '@stdlib/ndarray/shape' );
+var getOrder = require( '@stdlib/ndarray/order' );
+var ndims = require( '@stdlib/ndarray/ndims' );
+var format = require( '@stdlib/string/format' );
+var broadcastIndex = require( './broadcast_index.js' );
+var base = require( './base.js' );
+
+
+// MAIN //
+
+/**
+* Returns the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.
+*
+* @param {ndarrayLike} x - input ndarray
+* @param {(ndarrayLike|integer)} fromIndex - index from which to begin searching
+* @param {(ndarrayLike|integer)} toIndex - index at which to stop searching (exclusive)
+* @param {Options} [options] - function options
+* @param {integer} [options.dim=-1] - dimension over which to perform operation
+* @param {boolean} [options.keepdims=false] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
+* @param {*} [options.dtype] - output ndarray data type
+* @param {Function} clbk - callback function
+* @param {*} [thisArg] - callback execution context
+* @throws {TypeError} first argument must be an ndarray-like object
+* @throws {TypeError} callback argument must be a function
+* @throws {TypeError} options argument must be an object
+* @throws {TypeError} `fromIndex` argument must be either an ndarray-like object or an integer
+* @throws {TypeError} `toIndex` argument must be either an ndarray-like object or an integer
+* @throws {RangeError} dimension index must not exceed input ndarray bounds
+* @throws {RangeError} first argument must have at least one dimension
+* @throws {Error} must provide valid options
+* @returns {ndarray} output ndarray
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+*
+* function isEven( v ) {
+* return v % 2.0 === 0.0;
+* }
+*
+* // Create a data buffer:
+* var xbuf = [ 2.0, 1.0, 3.0, 4.0, 5.0, 6.0 ];
+*
+* // Define the shape of the input array:
+* var sh = [ 6 ];
+*
+* // Define the array strides:
+* var sx = [ 1 ];
+*
+* // Define the index offset:
+* var ox = 0;
+*
+* // Create an input ndarray:
+* var x = new ndarray( 'generic', xbuf, sh, sx, ox, 'row-major' );
+*
+* // Perform operation:
+* var out = findIndexBetween( x, 1, 4, isEven );
+* // returns [ 3 ]
+*/
+function findIndexBetween( x, fromIndex, toIndex ) {
+ var hasOptions;
+ var options;
+ var nargs;
+ var opts;
+ var ord;
+ var ctx;
+ var sh;
+ var cb;
+
+ nargs = arguments.length;
+ if ( !isndarrayLike( x ) ) {
+ throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
+ }
+ if ( !isInteger( fromIndex ) && !isndarrayLike( fromIndex ) ) {
+ throw new TypeError( format( 'invalid argument. Second argument must be either an ndarray or an integer. Value: `%s`.', fromIndex ) );
+ }
+ if ( !isInteger( toIndex ) && !isndarrayLike( toIndex ) ) {
+ throw new TypeError( format( 'invalid argument. Third argument must be either an ndarray or an integer. Value: `%s`.', toIndex ) );
+ }
+ // Resolve input ndarray meta data:
+ ord = getOrder( x );
+
+ // Initialize an options object:
+ opts = {
+ 'dims': [ -1 ], // default behavior is to perform a reduction over the last dimension
+ 'keepdims': false
+ };
+
+ // Initialize a flag indicating whether an `options` argument was provided:
+ hasOptions = false;
+
+ // Case: findIndexBetween( x, fromIndex, toIndex, clbk )
+ if ( nargs === 4 ) {
+ cb = arguments[ 3 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Fourth argument must be a function. Value: `%s`.', cb ) );
+ }
+ }
+ // Case: findIndexBetween( x, fromIndex, toIndex, ???, ??? )
+ else if ( nargs === 5 ) {
+ // Case: findIndexBetween( x, fromIndex, toIndex, clbk, thisArg )
+ if ( isFunction( arguments[ 3 ] ) ) {
+ cb = arguments[ 3 ];
+ ctx = arguments[ 4 ];
+ }
+ // Case: findIndexBetween( x, fromIndex, toIndex, options, clbk )
+ else {
+ options = arguments[ 3 ];
+ hasOptions = true;
+ cb = arguments[ 4 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Fifth argument must be a function. Value: `%s`.', cb ) );
+ }
+ }
+ }
+ // Case: findIndexBetween( x, fromIndex, toIndex, options, clbk, thisArg )
+ else {
+ options = arguments[ 3 ];
+ hasOptions = true;
+ cb = arguments[ 4 ];
+ if ( !isFunction( cb ) ) {
+ throw new TypeError( format( 'invalid argument. Fifth argument must be a function. Value: `%s`.', cb ) );
+ }
+ ctx = arguments[ 5 ];
+ }
+ if ( hasOptions ) {
+ if ( !isPlainObject( options ) ) {
+ throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+ }
+ // Resolve provided options...
+ if ( hasOwnProp( options, 'dim' ) ) {
+ opts.dims[ 0 ] = options.dim;
+ }
+ if ( hasOwnProp( options, 'keepdims' ) ) {
+ opts.keepdims = options.keepdims;
+ }
+ if ( hasOwnProp( options, 'dtype' ) ) {
+ opts.dtype = options.dtype;
+ }
+ }
+ if ( ndims( x ) < 1 ) {
+ throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
+ }
+ // Resolve the list of non-reduced dimensions:
+ sh = getShape( x );
+ sh = nonCoreShape( sh, opts.dims );
+
+ // Broadcast the indices to match the shape of the non-reduced dimensions...
+ return base( x, broadcastIndex( fromIndex, sh, ord ), broadcastIndex( toIndex, sh, ord ), opts, cb, ctx ); // eslint-disable-line max-len
+}
+
+
+// EXPORTS //
+
+module.exports = findIndexBetween;
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/package.json b/lib/node_modules/@stdlib/blas/ext/find-index-between/package.json
new file mode 100644
index 000000000000..b923612da33f
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/package.json
@@ -0,0 +1,66 @@
+{
+ "name": "@stdlib/blas/ext/find-index-between",
+ "version": "0.0.0",
+ "description": "Return the index of the first element along an ndarray dimension which passes a test implemented by a predicate function within a specified range.",
+ "license": "Apache-2.0",
+ "author": {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ },
+ "contributors": [
+ {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ }
+ ],
+ "main": "./lib",
+ "directories": {
+ "benchmark": "./benchmark",
+ "doc": "./docs",
+ "example": "./examples",
+ "lib": "./lib",
+ "test": "./test"
+ },
+ "types": "./docs/types",
+ "scripts": {},
+ "homepage": "https://github.com/stdlib-js/stdlib",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/stdlib-js/stdlib.git"
+ },
+ "bugs": {
+ "url": "https://github.com/stdlib-js/stdlib/issues"
+ },
+ "dependencies": {},
+ "devDependencies": {},
+ "engines": {
+ "node": ">=0.10.0",
+ "npm": ">2.7.0"
+ },
+ "os": [
+ "aix",
+ "darwin",
+ "freebsd",
+ "linux",
+ "macos",
+ "openbsd",
+ "sunos",
+ "win32",
+ "windows"
+ ],
+ "keywords": [
+ "stdlib",
+ "stdmath",
+ "mathematics",
+ "math",
+ "blas",
+ "find",
+ "index",
+ "between",
+ "search",
+ "range",
+ "array",
+ "ndarray"
+ ],
+ "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.assign.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.assign.js
new file mode 100644
index 000000000000..9a338e78c83c
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.assign.js
@@ -0,0 +1,1266 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
+var zeros = require( '@stdlib/ndarray/zeros' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var getDType = require( '@stdlib/ndarray/dtype' );
+var getShape = require( '@stdlib/ndarray/shape' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var getOrder = require( '@stdlib/ndarray/order' );
+var findIndexBetween = require( './../lib' ).assign;
+
+
+// FUNCTIONS //
+
+/**
+* Callback function.
+*
+* @private
+* @param {number} v - input value
+* @returns {boolean} result
+*/
+function clbk( v ) {
+ return v % 2.0 === 0.0;
+}
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof findIndexBetween, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object', function test( t ) {
+ var values;
+ var i;
+ var y;
+
+ y = zeros( [], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, y, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (thisArg)', function test( t ) {
+ var values;
+ var i;
+ var y;
+
+ y = zeros( [], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, y, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (options)', function test( t ) {
+ var values;
+ var i;
+ var y;
+
+ y = zeros( [], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, y, {}, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (options, thisArg)', function test( t ) {
+ var values;
+ var i;
+ var y;
+
+ y = zeros( [], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, y, {}, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a zero-dimensional input ndarray-like object', function test( t ) {
+ var values;
+ var i;
+ var y;
+
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ values = [
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( zeros( value ), 0, 1, y, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a fourth argument which is not an ndarray-like object', function test( t ) {
+ var values;
+ var i;
+ var x;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a fourth argument which is not an ndarray-like object (thisArg)', function test( t ) {
+ var values;
+ var i;
+ var x;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a fourth argument which is not an ndarray-like object (options)', function test( t ) {
+ var values;
+ var i;
+ var x;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, {}, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a fourth argument which is not an ndarray-like object (options, thisArg)', function test( t ) {
+ var values;
+ var i;
+ var x;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, {}, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function', function test( t ) {
+ var values;
+ var i;
+ var x;
+ var y;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, value );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (thisArg)', function test( t ) {
+ var values;
+ var i;
+ var x;
+ var y;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, value, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (options)', function test( t ) {
+ var values;
+ var i;
+ var x;
+ var y;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, {}, value );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (options, thisArg)', function test( t ) {
+ var values;
+ var i;
+ var x;
+ var y;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, {}, value, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided an options argument which is not an object', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var y;
+ var i;
+
+ opts = {
+ 'dtype': 'generic'
+ };
+
+ x = zeros( [ 2, 2 ], opts );
+ y = zeros( [], opts );
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, value, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided an options argument which is not an object (thisArg)', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var y;
+ var i;
+
+ opts = {
+ 'dtype': 'generic'
+ };
+
+ x = zeros( [ 2, 2 ], opts );
+ y = zeros( [], opts );
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, y, value, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `fromIndex` argument which is not an ndarray-like object or an integer', function test( t ) {
+ var values;
+ var x;
+ var y;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, value, 2, y, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `fromIndex` argument which is not an ndarray-like object or an integer (options)', function test( t ) {
+ var values;
+ var x;
+ var y;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, value, 2, y, {}, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `toIndex` argument which is not an ndarray-like object or an integer', function test( t ) {
+ var values;
+ var x;
+ var y;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, value, y, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `toIndex` argument which is not an ndarray-like object or an integer (options)', function test( t ) {
+ var values;
+ var x;
+ var y;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, value, y, {}, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided insufficient number of arguments', function test( t ) {
+ var x;
+ var y;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ y = zeros( [], {
+ 'dtype': 'int32'
+ });
+
+ t.throws( badValue1, TypeError, 'throws an error when provided insufficient arguments' );
+ t.throws( badValue2, TypeError, 'throws an error when provided insufficient arguments' );
+ t.throws( badValue3, TypeError, 'throws an error when provided insufficient arguments' );
+ t.throws( badValue4, TypeError, 'throws an error when provided insufficient arguments' );
+ t.end();
+
+ function badValue1() {
+ findIndexBetween( x );
+ }
+
+ function badValue2() {
+ findIndexBetween( x, 0 );
+ }
+
+ function badValue3() {
+ findIndexBetween( x, 0, 2, y );
+ }
+
+ function badValue4() {
+ findIndexBetween();
+ }
+});
+
+tape( 'the function throws an error if provided a `dim` option which is not an integer', function test( t ) {
+ var options;
+ var values;
+ var opts;
+ var x;
+ var y;
+ var i;
+
+ opts = {
+ 'dtype': 'generic'
+ };
+
+ x = zeros( [ 2, 2 ], opts );
+ y = zeros( [], opts );
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [ 'a' ],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ options = {
+ 'dim': value
+ };
+ findIndexBetween( x, 0, 2, y, options, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `dim` option which is not an integer (thisArg)', function test( t ) {
+ var options;
+ var values;
+ var opts;
+ var x;
+ var y;
+ var i;
+
+ opts = {
+ 'dtype': 'generic'
+ };
+
+ x = zeros( [ 2, 2 ], opts );
+ y = zeros( [], opts );
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [ 'a' ],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ options = {
+ 'dim': value
+ };
+ findIndexBetween( x, 0, 2, y, options, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function returns the index of the first element which passes a test (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ actual = findIndexBetween( x, 0, 2, y, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns the index of the first element which passes a test (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'column-major'
+ });
+
+ actual = findIndexBetween( x, 0, 2, y, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying an operation dimension (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+ var y;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+ opts = {
+ 'dim': 0
+ };
+
+ actual = findIndexBetween( x, 0, 2, y, opts, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+ opts = {
+ 'dim': 1
+ };
+
+ actual = findIndexBetween( x, 0, 2, y, opts, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying an operation dimension (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+ var y;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'column-major'
+ });
+ opts = {
+ 'dim': 0
+ };
+
+ actual = findIndexBetween( x, 0, 2, y, opts, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'column-major'
+ });
+ opts = {
+ 'dim': 1
+ };
+
+ actual = findIndexBetween( x, 0, 2, y, opts, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ actual = findIndexBetween( x, 1, 3, y, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, -3.0, 2.0, 6.0, 4.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 1, 2 ], 0, 'column-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'column-major'
+ });
+
+ actual = findIndexBetween( x, 1, 3, y, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (scalar, options)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ actual = findIndexBetween( x, 1, 3, y, {}, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'generic'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'generic'
+ });
+ actual = findIndexBetween( x, fromIdx, toIdx, y, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray, options)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'int32'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'int32'
+ });
+ actual = findIndexBetween( x, fromIdx, toIdx, y, {}, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (scalar, broadcasted)', function test( t ) {
+ var expected;
+ var actual;
+ var opts;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, 1, 3, y, opts, clbk );
+ expected = [ 1, -1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray, broadcasted)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var opts;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'int32'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'int32'
+ });
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, fromIdx, toIdx, y, opts, clbk );
+ expected = [ 1, -1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (1d ndarray)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var opts;
+ var xbuf;
+ var x;
+ var y;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+
+ fromIdx = new ndarray( 'generic', [ 1, 0 ], [ 2 ], [ 1 ], 0, 'row-major' );
+ toIdx = new ndarray( 'generic', [ 3, 3 ], [ 2 ], [ 1 ], 0, 'row-major' );
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, fromIdx, toIdx, y, opts, clbk );
+ expected = [ 1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports providing an execution context', function test( t ) {
+ var expected;
+ var indices;
+ var values;
+ var arrays;
+ var actual;
+ var xbuf;
+ var ctx;
+ var x;
+ var y;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ y = zeros( [ 2 ], {
+ 'dtype': 'generic',
+ 'order': 'row-major'
+ });
+ ctx = {
+ 'count': 0
+ };
+
+ values = [];
+ indices = [];
+ arrays = [];
+
+ actual = findIndexBetween( x, 0, 2, y, clbk1, ctx );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( y, actual, 'returns expected value' );
+ t.strictEqual( ctx.count, 4, 'returns expected value' );
+
+ expected = [
+ -1.0,
+ 2.0,
+ -3.0,
+ 4.0
+ ];
+ t.deepEqual( values, expected, 'returns expected value' );
+
+ expected = [
+ [ 0, 0 ],
+ [ 0, 1 ],
+ [ 1, 0 ],
+ [ 1, 1 ]
+ ];
+ t.deepEqual( indices, expected, 'returns expected value' );
+
+ expected = [
+ x,
+ x,
+ x,
+ x
+ ];
+ t.deepEqual( arrays, expected, 'returns expected value' );
+
+ t.end();
+
+ function clbk1( v, idx, arr ) {
+ this.count += 1; // eslint-disable-line no-invalid-this
+ values.push( v );
+ indices.push( idx );
+ arrays.push( arr );
+ return v % 2.0 === 0.0;
+ }
+});
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.js
new file mode 100644
index 000000000000..0ec22b403f7e
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.js
@@ -0,0 +1,39 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isMethod = require( '@stdlib/assert/is-method' );
+var findIndexBetween = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof findIndexBetween, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'attached to the main export is an `assign` method', function test( t ) {
+ t.strictEqual( isMethod( findIndexBetween, 'assign' ), true, 'returns expected value' );
+ t.end();
+});
diff --git a/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.main.js b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.main.js
new file mode 100644
index 000000000000..c0dbd4713693
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/find-index-between/test/test.main.js
@@ -0,0 +1,1062 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
+var zeros = require( '@stdlib/ndarray/zeros' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var getDType = require( '@stdlib/ndarray/dtype' );
+var getShape = require( '@stdlib/ndarray/shape' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var getOrder = require( '@stdlib/ndarray/order' );
+var findIndexBetween = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Callback function.
+*
+* @private
+* @param {number} v - input value
+* @returns {boolean} result
+*/
+function clbk( v ) {
+ return v % 2.0 === 0.0;
+}
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof findIndexBetween, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (thisArg)', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (options)', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, {}, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a first argument which is not an ndarray-like object (options, thisArg)', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ '5',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( value, 0, 2, {}, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a zero-dimensional input ndarray-like object', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( zeros( value ), 0, 1, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'float64'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (thisArg)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'float64'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (options)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'float64'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, {}, value );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a callback argument which is not a function (options, thisArg)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'float64'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, {}, value, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided an options argument which is not an object', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided an options argument which is not an object (thisArg)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ []
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, 2, value, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `fromIndex` argument which is not an ndarray-like object or an integer', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, value, 2, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `fromIndex` argument which is not an ndarray-like object or an integer (thisArg)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, value, 2, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `toIndex` argument which is not an ndarray-like object or an integer', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, value, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `toIndex` argument which is not an ndarray-like object or an integer (thisArg)', function test( t ) {
+ var values;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ findIndexBetween( x, 0, value, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided insufficient number of arguments', function test( t ) {
+ var x;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ t.throws( badValue1, TypeError, 'throws an error when provided insufficient arguments' );
+ t.throws( badValue2, TypeError, 'throws an error when provided insufficient arguments' );
+ t.throws( badValue3, TypeError, 'throws an error when provided insufficient arguments' );
+ t.end();
+
+ function badValue1() {
+ findIndexBetween( x );
+ }
+
+ function badValue2() {
+ findIndexBetween( x, 0 );
+ }
+
+ function badValue3() {
+ findIndexBetween();
+ }
+});
+
+tape( 'the function throws an error if provided a `dtype` option which is not a supported data type', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ 'bool',
+ 'complex64',
+ 'complex128',
+ 'boop'
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ opts = {
+ 'dtype': value
+ };
+ findIndexBetween( x, 0, 2, opts, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `dtype` option which is not a supported data type (thisArg)', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ 'bool',
+ 'complex64',
+ 'complex128',
+ 'boop'
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ opts = {
+ 'dtype': value
+ };
+ findIndexBetween( x, 0, 2, opts, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `dim` option which is not an integer', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [ 'a' ],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ opts = {
+ 'dim': value
+ };
+ findIndexBetween( x, 0, 2, opts, clbk );
+ };
+ }
+});
+
+tape( 'the function throws an error if provided a `dim` option which is not an integer (thisArg)', function test( t ) {
+ var values;
+ var opts;
+ var x;
+ var i;
+
+ x = zeros( [ 2, 2 ], {
+ 'dtype': 'generic'
+ });
+
+ values = [
+ '5',
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [ 'a' ],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[ i ] ), TypeError, 'throws an error when provided ' + values[ i ] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ opts = {
+ 'dim': value
+ };
+ findIndexBetween( x, 0, 2, opts, clbk, {} );
+ };
+ }
+});
+
+tape( 'the function returns the index of the first element which passes a test (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+
+ actual = findIndexBetween( x, 0, 2, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns the index of the first element which passes a test (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+
+ actual = findIndexBetween( x, 0, 2, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying the operation dimension (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ opts = {
+ 'dim': 0
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ opts = {
+ 'dim': 1
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying the operation dimension (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+ opts = {
+ 'dim': 0
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 1, 2 ], 0, 'column-major' );
+ opts = {
+ 'dim': 1
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ -1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports whether to keep reduced dimensions as singleton dimensions', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ opts = {
+ 'keepdims': true
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ [ 1 ], [ 1 ] ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2, 1 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying the output array data type', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var opts;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ opts = {
+ 'dtype': 'int32'
+ };
+
+ actual = findIndexBetween( x, 0, 2, opts, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'int32', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting search index (row-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+
+ actual = findIndexBetween( x, 1, 3, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting search index (column-major)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, -3.0, 2.0, 6.0, 4.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 1, 2 ], 0, 'column-major' );
+
+ actual = findIndexBetween( x, 1, 3, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting search index (scalar, options)', function test( t ) {
+ var expected;
+ var actual;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+
+ actual = findIndexBetween( x, 1, 3, {}, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'generic'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'generic'
+ });
+ actual = findIndexBetween( x, fromIdx, toIdx, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray, options)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 3 ], [ 3, 1 ], 0, 'row-major' );
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'int32'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'int32'
+ });
+ actual = findIndexBetween( x, fromIdx, toIdx, {}, clbk );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (scalar, broadcasted)', function test( t ) {
+ var expected;
+ var actual;
+ var opts;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, 1, 3, opts, clbk );
+ expected = [ 1, -1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (0d ndarray, broadcasted)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var opts;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+
+ fromIdx = scalar2ndarray( 1, {
+ 'dtype': 'int32'
+ });
+ toIdx = scalar2ndarray( 3, {
+ 'dtype': 'int32'
+ });
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, fromIdx, toIdx, opts, clbk );
+ expected = [ 1, -1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports specifying a starting and ending search index (1d ndarray)', function test( t ) {
+ var expected;
+ var fromIdx;
+ var actual;
+ var toIdx;
+ var opts;
+ var xbuf;
+ var x;
+
+ xbuf = [ 1.0, 2.0, 4.0, -3.0, 6.0, -5.0 ];
+ x = new ndarray( 'generic', xbuf, [ 3, 2 ], [ 2, 1 ], 0, 'row-major' );
+
+ fromIdx = new ndarray( 'generic', [ 1, 0 ], [ 2 ], [ 1 ], 0, 'row-major' );
+ toIdx = new ndarray( 'generic', [ 3, 3 ], [ 2 ], [ 1 ], 0, 'row-major' );
+ opts = {
+ 'dim': 0
+ };
+ actual = findIndexBetween( x, fromIdx, toIdx, opts, clbk );
+ expected = [ 1, 0 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports providing an execution context', function test( t ) {
+ var expected;
+ var indices;
+ var values;
+ var arrays;
+ var actual;
+ var xbuf;
+ var ctx;
+ var x;
+
+ xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+ x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+ ctx = {
+ 'count': 0
+ };
+
+ values = [];
+ indices = [];
+ arrays = [];
+
+ actual = findIndexBetween( x, 0, 2, clbk1, ctx );
+ expected = [ 1, 1 ];
+
+ t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+ t.strictEqual( String( getDType( actual ) ), 'generic', 'returns expected value' );
+ t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+ t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+ t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+ t.strictEqual( ctx.count, 4, 'returns expected value' );
+
+ expected = [
+ -1.0,
+ 2.0,
+ -3.0,
+ 4.0
+ ];
+ t.deepEqual( values, expected, 'returns expected value' );
+
+ expected = [
+ [ 0, 0 ],
+ [ 0, 1 ],
+ [ 1, 0 ],
+ [ 1, 1 ]
+ ];
+ t.deepEqual( indices, expected, 'returns expected value' );
+
+ expected = [
+ x,
+ x,
+ x,
+ x
+ ];
+ t.deepEqual( arrays, expected, 'returns expected value' );
+
+ t.end();
+
+ function clbk1( v, idx, arr ) {
+ this.count += 1; // eslint-disable-line no-invalid-this
+ values.push( v );
+ indices.push( idx );
+ arrays.push( arr );
+ return v % 2.0 === 0.0;
+ }
+});