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base/mskfilter-map/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 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.
+
+-->
+
+# mskfilterMap
+
+> Apply a mask to a provided input array and return a new array after applying a mapping function.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var mskfilterMap = require( '@stdlib/array/base/mskfilter-map' );
+```
+
+#### mskfilterMap( x, mask, clbk\[, thisArg] )
+
+Applies a mask to a provided input array and returns a new array after applying a mapping function.
+
+```javascript
+function clbk( value ) {
+    return value * 2;
+}
+
+var x = [ 1, 2, 3, 4 ];
+var m = [ 0, 1, 0, 1 ];
+
+var y = mskfilterMap( x, m, clbk );
+// returns [ 4, 8 ]
+```
+
+The function supports the following parameters:
+
+-   **x**: input array.
+-   **mask**: mask array.
+-   **clbk**: function to apply.
+-   **thisArg**: applied function execution context (_optional_).
+
+To set the applied function's execution context, provide a `thisArg`.
+
+<!-- eslint-disable no-invalid-this -->
+
+```javascript
+function clbk( x ) {
+    this.count += 1;
+    return x;
+}
+
+var x = [ 1, 2, 3, 4 ];
+var m = [ 1, 1, 0, 1 ];
+
+var ctx = {
+    'count': 0
+};
+
+var y = mskfilterMap( x, m, clbk, ctx );
+// returns [ 1, 2, 4 ]
+
+var v = ctx.count;
+// returns 3
+```
+
+The function **always** returns a new "generic" array.
+
+#### mskfilterMap.assign( x, mask, out, stride, offset, clbk\[, thisArg] )
+
+Applies a mask and mapping function to a provided input array and assigns results to elements in a provided output array.
+
+```javascript
+function clbk( value ) {
+    return value * 2;
+}
+
+var x = [ 1, 2, 3, 4 ];
+var m = [ 0, 1, 0, 1 ];
+
+var out = [ 0, 0, 0, 0 ];
+var arr = mskfilterMap.assign( x, m, out, -2, out.length-1, clbk );
+// returns [ 0, 8, 0, 4 ]
+
+var bool = ( arr === out );
+// returns true
+```
+
+The function supports the following parameters:
+
+-   **x**: input array.
+-   **mask**: mask array.
+-   **out**: output array.
+-   **stride**: output array stride.
+-   **offset**: output array offset.
+-   **clbk**: function to apply.
+-   **thisArg**: applied function execution context (_optional_).
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If a `mask` array element is truthy, the corresponding element in `x` is **included** in the output array; otherwise, the corresponding element in `x` is "masked" and thus **excluded** from the output array.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var zeroTo = require( '@stdlib/array/base/zero-to' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var abs2 = require( '@stdlib/math/base/special/abs2' );
+var mskfilterMap = require( '@stdlib/array/base/mskfilter-map' );
+
+// Generate a linearly spaced array:
+var x = zeroTo( 20 );
+console.log( x );
+
+// Generate a random mask:
+var mask = bernoulli( x.length, 0.5, {
+    'dtype': 'generic'
+});
+console.log( mask );
+
+// Filter an array using the mask:
+var y = mskfilterMap( x, mask, abs2 );
+console.log( y );
+```
+
+</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">
+
+</section>
+
+<!-- /.links -->

base/mskfilter-map/benchmark/benchmark.assign.length.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 zeroTo = require( './../../../base/zero-to' );
+var zeros = require( './../../../zeros' );
+var ones = require( './../../../ones' );
+var isArray = require( '@stdlib/assert/is-array' );
+var isnan = require( '@stdlib/assert/is-nan' ).isPrimitive;
+var identity = require( '@stdlib/math/base/special/identity' );
+var pkg = require( './../package.json' ).name;
+var mskfilterMap = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var mask;
+	var out;
+	var x;
+
+	x = zeroTo( len, 'generic' );
+	mask = ones( len, 'generic' );
+	out = zeros( len, 'generic' );
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var v;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			v = mskfilterMap.assign( x, mask, out, 1, 0, identity );
+			if ( typeof v !== 'object' ) {
+				b.fail( 'should return an array' );
+			}
+		}
+		b.toc();
+		if ( !isArray( v ) || isnan( v[ i%len ] ) ) {
+			b.fail( 'should return an array' );
+		}
+		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( pkg+':assign:len='+len, f );
+	}
+}
+
+main();

base/mskfilter-map/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 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 isArray = require( '@stdlib/assert/is-array' );
+var zeroTo = require( './../../../base/zero-to' );
+var ones = require( './../../../base/ones' );
+var identity = require( '@stdlib/math/base/special/identity' );
+var pkg = require( './../package.json' ).name;
+var mskfilterMap = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg+'::copy:len=100', function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+	var v;
+
+	x = zeroTo( 100 );
+	y = ones( x.length );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		v = mskfilterMap( x, y, identity );
+		if ( typeof v !== 'object' ) {
+			b.fail( 'should return an array' );
+		}
+	}
+	b.toc();
+	if ( !isArray( v ) ) {
+		b.fail( 'should return an array' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});