feat: add number/int32/base/signbit

lib/node_modules/@stdlib/number/int32/base/signbit/README.md

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+<!--
+
+@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.
+
+-->
+
+# signbit
+
+> Return a boolean indicating if the sign bit for a signed 32-bit integer is on (true) or off (false).
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var signbit = require( '@stdlib/number/int32/base/signbit' );
+```
+
+#### signbit( x )
+
+Returns a boolean indicating if the sign bit for a signed 32-bit integer is on (`true`) or off (`false`).
+
+```javascript
+var bool = signbit( 4 );
+// returns false
+
+bool = signbit( -4 );
+// returns true
+
+bool = signbit( 0 );
+// returns false
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var signbit = require( '@stdlib/number/int32/base/signbit' );
+
+var x = discreteUniform( 100, -50, 50, {
+    'dtype': 'generic'
+});
+logEachMap( 'x: %d. signbit: %s.', x, signbit );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/number/int32/base/signbit/benchmark/benchmark.js

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+/**
+* @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 discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
+var pkg = require( './../package.json' ).name;
+var signbit = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = discreteUniform( 100, -100, 100, {
+		'dtype': 'generic'
+	});
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = signbit( x[ i%x.length ] );
+		if ( typeof y !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( y ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/number/int32/base/signbit/docs/repl.txt

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+
+{{alias}}( x )
+    Returns a boolean indicating if the sign bit is on (true) or off (false).
+
+    Parameters
+    ----------
+    x: integer
+        Signed 32-bit integer.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating if sign bit is on or off.
+
+    Examples
+    --------
+    > var bool = {{alias}}( 4 )
+    false
+    > bool = {{alias}}( -4 )
+    true
+    > bool = {{alias}}( 0 )
+    false
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/number/int32/base/signbit/docs/types/index.d.ts

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+/*
+* @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
+
+/**
+* Returns a boolean indicating if the sign bit is on (true) or off (false).
+*
+* @param x - input value
+* @returns boolean indicating if sign bit is on or off
+*
+* @example
+* var bool = signbit( 4 );
+* // returns false
+*
+* @example
+* var bool = signbit( -4 );
+* // returns true
+*
+* @example
+* var bool = signbit( 0 );
+* // returns false
+*/
+declare function signbit( x: number ): boolean;
+
+
+// EXPORTS //
+
+export = signbit;

lib/node_modules/@stdlib/number/int32/base/signbit/docs/types/test.ts

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+/*
+* @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.
+*/
+
+import signbit = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+	signbit( 1 ); // $ExpectType boolean
+	signbit( -1 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided a value other than a number...
+{
+	signbit( true ); // $ExpectError
+	signbit( false ); // $ExpectError
+	signbit( 'abc' ); // $ExpectError
+	signbit( [] ); // $ExpectError
+	signbit( {} ); // $ExpectError
+	signbit( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+	signbit(); // $ExpectError
+}

lib/node_modules/@stdlib/number/int32/base/signbit/examples/index.js

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+/**
+* @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/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var signbit = require( './../lib' );
+
+var x = discreteUniform( 100, -50, 50, {
+	'dtype': 'generic'
+});
+logEachMap( 'x: %d. signbit: %s.', x, signbit );

lib/node_modules/@stdlib/number/int32/base/signbit/lib/index.js

@@ -0,0 +1,46 @@
+/**
+* @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 a boolean indicating if the sign bit is on (true) or off (false).
+*
+* @module @stdlib/number/int32/base/signbit
+*
+* @example
+* var signbit = require( '@stdlib/number/int32/base/signbit' );
+*
+* var bool = signbit( 4 );
+* // returns false
+*
+* var bool = signbit( -4 );
+* // returns true
+*
+* var bool = signbit( 0 );
+* // returns false
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;

lib/node_modules/@stdlib/number/int32/base/signbit/lib/main.js

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+/**
+* @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';
+
+// MAIN //
+
+/**
+* Returns a boolean indicating if the sign bit is on (true) or off (false).
+*
+* @param {integer32} x - signed 32-bit integer
+* @returns {boolean} boolean indicating if sign bit is on or off
+*
+* @example
+* var bool = signbit( 4 );
+* // returns false
+*
+* @example
+* var bool = signbit( -4 );
+* // returns true
+*
+* @example
+* var bool = signbit( 0 );
+* // returns false
+*/
+function signbit( x ) {
+	// Shift off all bits which are not the sign bit and check if the sign bit is on:
+	return ( x >>> 31 ) ? true : false; // eslint-disable-line no-unneeded-ternary
+}
+
+
+// EXPORTS //
+
+module.exports = signbit;