feat: add reverse method for array/uint64

lib/node_modules/@stdlib/array/uint64/README.md

@@ -335,6 +335,19 @@ var u = arr.get( 100 );
 // returns undefined
 ```
 
+<a name="method-reverse"></a>
+
+#### Uint64Array.prototype.reverse()
+
+Reverses an array in-place.
+
+```javascript
+var arr = new Uint64Array( [ 1, 2, 3 ] );
+
+var out = arr.reverse();
+// returns <Uint64Array>[ 3n, 2n, 1n ]
+```
+
 <a name="method-set"></a>
 
 #### Uint64Array.prototype.set( value\[, i] )

lib/node_modules/@stdlib/array/uint64/benchmark/benchmark.reverse.js

@@ -0,0 +1,53 @@
+/**
+* @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 isUint64Array = require( '@stdlib/assert/is-uint64array' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var Uint64Array = require( './../lib' );
+
+
+// MAIN //
+
+bench( format( '%s:reverse', pkg ), function benchmark( b ) {
+	var arr;
+	var out;
+	var i;
+
+	arr = new Uint64Array( 10 );
+
+	// Benchmark worst case scenario (i.e., every element pair is swapped in-place)...
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = arr.reverse();
+		if ( typeof out !== 'object' ) {
+			b.fail( 'should return an object' );
+		}
+	}
+	b.toc();
+	if ( !isUint64Array( out ) ) {
+		b.fail( 'should return a Uint64Array' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/array/uint64/benchmark/benchmark.reverse.length.js

@@ -0,0 +1,96 @@
+/**
+* @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 pow = require( '@stdlib/math/base/special/pow' );
+var isUint64Array = require( '@stdlib/assert/is-uint64array' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var Uint64Array = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var arr = new Uint64Array( len );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		// Benchmark worst case scenario (i.e., every element pair is swapped in-place)...
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			out = arr.reverse();
+			if ( typeof out !== 'object' ) {
+				b.fail( 'should return an object' );
+			}
+		}
+		b.toc();
+		if ( !isUint64Array( out ) ) {
+			b.fail( 'should return a Uint64Array' );
+		}
+		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:reverse:len=%d', pkg, len ), f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/array/uint64/docs/repl.txt

@@ -299,6 +299,23 @@
     <Uint64>[ 2n ]
 
 
+{{alias}}.prototype.reverse()
+    Reverses the array *in-place*.
+
+    This method mutates the array on which the method is invoked.
+
+    Returns
+    -------
+    out: Uint64Array
+        Modified array.
+
+    Examples
+    --------
+    > var arr = new {{alias}}( [ 1, 2, 3 ] );
+    > arr.reverse()
+    <Uint64Array>[ 3n, 2n, 1n ]
+
+
 {{alias}}.prototype.set( v[, i] )
     Sets one or more array elements.
 

lib/node_modules/@stdlib/array/uint64/docs/types/index.d.ts

@@ -28,7 +28,7 @@
 import ArrayBuffer = require( '@stdlib/array/buffer' );
 
 // Define a union type representing both iterable and non-iterable iterators:
 type Iterator = Iter | IterableIterator;
 
 // Define a type representing a value from which a 64-bit unsigned integer can be derived:
 type Uint = Uint64 | bigint | number;
@@ -36,7 +36,7 @@
 /**
 * Locale-specific configuration options.
 */
 interface LocaleOptions<T = unknown> {
 	/**
 	* Configuration property.
 	*/
@@ -118,7 +118,7 @@
 * @param arr - array on which the method was called
 * @returns boolean indicating whether an element in an array passes a test
 */
 type Predicate<U> = NullaryPredicate<U> | UnaryPredicate<U> | BinaryPredicate<U> | TernaryPredicate<U>;
 
 /**
 * Callback invoked for each element in an array.
@@ -162,7 +162,7 @@
 * @param arr - array on which the method was called
 * @returns undefined
 */
 type Callback<U> = NullaryCallback<U> | UnaryCallback<U> | BinaryCallback<U> | TernaryCallback<U>;
 
 /**
 * Callback invoked for each element in an array.
@@ -206,7 +206,7 @@
 * @param arr - array on which the method was called
 * @returns transformed value
 */
 type MapFcn<U> = NullaryMapFcn<U> | UnaryMapFcn<U> | BinaryMapFcn<U> | TernaryMapFcn<U>;
 
 /**
 * Reducer function invoked for each element in an array.
@@ -260,7 +260,7 @@
 * @param arr - array on which the method was called
 * @returns accumulated result
 */
 type Reducer<U> = NullaryReducer<U> | UnaryReducer<U> | BinaryReducer<U> | TernaryReducer<U> | QuaternaryReducer<U>;
 
 /**
 * Comparator function.
@@ -269,7 +269,7 @@
 * @param b - second value for comparison
 * @returns number indicating comparison result
 */
 type CompareFcn = ( a: Uint64, b: Uint64 ) => number;
 
 /**
 * Class for creating a 64-bit unsigned integer array.
@@ -477,6 +477,19 @@
 	*/
 	get( i: number ): Uint64 | void;
 
+	/**
+	* Reverses an array in-place.
+	*
+	* @returns reversed array
+	*
+	* @example
+	* var arr = new Uint64Array( [ 1, 2, 3 ] );
+	*
+	* var out = arr.reverse();
+	* // returns <Uint64Array>[ 3n, 2n, 1n ]
+	*/
+	reverse(): Uint64Array;
+
 	/**
 	* Sets an array element.
 	*

lib/node_modules/@stdlib/array/uint64/lib/main.js

@@ -32,6 +32,7 @@
 var isFunction = require( '@stdlib/assert/is-function' );
 var isUint64 = require( '@stdlib/assert/is-uint64' );
 var isInteger = require( '@stdlib/math/base/assert/is-integer' );
+var floor = require( '@stdlib/math/base/special/floor' );
 var ITERATOR_SYMBOL = require( '@stdlib/symbol/iterator' );
 var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
 var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
@@ -758,6 +759,46 @@
 	return this._length;
 });
 
+/**
+* Reverses an array in-place.
+*
+* @name reverse
+* @memberof Uint64Array.prototype
+* @type {Function}
+* @throws {TypeError} `this` must be a 64-bit unsigned integer array
+* @returns {Uint64Array} reversed array
+*
+* @example
+* var arr = new Uint64Array( [ 1, 2, 3 ] );
+*
+* var out = arr.reverse();
+* // returns <Uint64Array>[ 3n, 2n, 1n ]
+*/
+setReadOnly( Uint64Array.prototype, 'reverse', function reverse() {
+	var buf;
+	var tmp;
+	var len;
+	var N;
+	var i;
+	var j;
+	if ( !isUint64Array( this ) ) {
+		throw new TypeError( 'invalid invocation. `this` is not a 64-bit unsigned integer array.' );
+	}
+	len = this._length;
+	buf = this._buffer;
+	N = floor( len / 2 );
+	for ( i = 0; i < N; i++ ) {
+		j = len - i - 1;
+		tmp = buf[ (2*i)+indices.HIGH ];
+		buf[ (2*i)+indices.HIGH ] = buf[ (2*j)+indices.HIGH ];
+		buf[ (2*j)+indices.HIGH ] = tmp;
+		tmp = buf[ (2*i)+indices.LOW ];
+		buf[ (2*i)+indices.LOW ] = buf[ (2*j)+indices.LOW ];
+		buf[ (2*j)+indices.LOW ] = tmp;
+	}
+	return this;
+});
+
 /**
 * Sets an array element.
 *
@@ -839,7 +880,7 @@
 		buf[ idx+indices.LOW ] = words[ 1 ];
 		return;
 	}
 	if ( isNonNegativeInteger( value ) || ( isBigInt( value ) && isNonNegativeInteger( Number( value ) ) ) ) {
 		if ( idx >= this._length ) {
 			throw new RangeError( format( 'invalid argument. Index argument is out-of-bounds. Value: `%u`.', idx ) );
 		}

lib/node_modules/@stdlib/array/uint64/test/test.reverse.js

@@ -0,0 +1,116 @@
+/**
+* @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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
+var isFunction = require( '@stdlib/assert/is-function' );
+var instanceOf = require( '@stdlib/assert/instance-of' );
+var isEqual = require( '@stdlib/number/uint64/base/assert/is-equal' );
+var Uint64 = require( '@stdlib/number/uint64/ctor' );
+var Uint64Array = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof Uint64Array, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'attached to the prototype of the main export is a `reverse` method', function test( t ) {
+	t.strictEqual( hasOwnProp( Uint64Array.prototype, 'reverse' ), true, 'has property' );
+	t.strictEqual( isFunction( Uint64Array.prototype.reverse ), true, 'has method' );
+	t.end();
+});
+
+tape( 'the method throws an error if invoked with a `this` context which is not a 64-bit unsigned integer array instance', function test( t ) {
+	var values;
+	var arr;
+	var i;
+
+	arr = new Uint64Array( 5 );
+
+	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() {
+			return arr.reverse.call( value );
+		};
+	}
+});
+
+tape( 'the method returns an empty array if operating on an empty 64-bit unsigned integer array', function test( t ) {
+	var arr;
+	var out;
+
+	arr = new Uint64Array();
+	out = arr.reverse();
+
+	t.strictEqual( out.buffer, arr.buffer, 'returns expected value' );
+	t.strictEqual( out.length, 0, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the method reverses elements of a 64-bit unsigned integer array in-place', function test( t ) {
+	var expected;
+	var arr;
+	var out;
+	var i;
+
+	arr = new Uint64Array( [ 1, 2, 3 ] );
+	expected = [ 3, 2, 1 ];
+	out = arr.reverse();
+
+	t.strictEqual( instanceOf( arr, Uint64Array ), true, 'returns expected value' );
+	t.strictEqual( out, arr, 'returns expected value' );
+	t.strictEqual( arr.length, expected.length, 'returns expected value' );
+	for ( i = 0; i < expected.length; i++ ) {
+		t.strictEqual( isEqual( arr.get( i ), new Uint64( expected[ i ] ) ), true, 'returns expected value' );
+	}
+	t.end();
+});
+
+tape( 'the method does not change the array length', function test( t ) {
+	var arr;
+	var out;
+
+	arr = new Uint64Array( 10 );
+	out = arr.reverse();
+
+	t.strictEqual( out.length, 10, 'returns expected value' );
+	t.end();
+});