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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 resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// MAIN //
/**
* Returns a new array after applying a mask and a callback function to a provided input array.
*
* @param {Collection} x - input array
* @param {Collection} mask - mask array
* @param {Function} clbk - callback function
* @param {*} [thisArg] - callback execution context
* @returns {Array} output array
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var mask = [ 0, 1, 0, 1 ];
*
* function scale( val ) {
* return 10 * val;
* }
*
* var y = mskfilterMap( x, mask, scale );
* // returns [ 20, 40 ]
*/
function mskfilterMap( x, mask, clbk, thisArg ) {
var xget;
var mget;
var out;
var i;
// Resolve accessors for retrieving array elements:
xget = resolveGetter( x );
mget = resolveGetter( mask );
// Extract each desired element from the provided array...
out = [];
for ( i = 0; i < x.length; i++ ) {
if ( mget( mask, i ) ) {
out.push( clbk.call( thisArg, xget( x, i ), i, x ) ); // use `Array#push` to ensure "fast" elements
}
}
return out;
}
// EXPORTS //
module.exports = mskfilterMap;
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