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* @license Apache-2.0
*
* Copyright (c) 2025 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 new arrays by applying a mask to one or more provided input arrays in a single pass.
*
* @param {Collection} x - first input array
* @param {Collection} [...arrays] - additional input arrays
* @param {Collection} mask - mask array
* @returns {Array<Array>} output arrays
*
* @example
* var x = [ 1, 2, 3, 4 ];
* var y = [ 5, 6, 7, 8 ];
* var mask = [ 0, 1, 0, 1 ];
*
* var out = mskfiltern( x, y, mask );
* // returns [ [ 2, 4 ], [ 6, 8 ] ]
*/
function mskfiltern() {
var getters;
var arrays;
var nargs;
var mget;
var mask;
var out;
var i;
var j;
nargs = arguments.length;
nargs -= 1;
// Resolve the mask array and its associated accessor:
mask = arguments[ nargs ];
mget = resolveGetter( mask );
// Resolve accessors for retrieving array elements and initialize the output arrays...
getters = [];
arrays = [];
out = [];
for ( i = 0; i < nargs; i++ ) {
arrays.push( arguments[ i ] );
getters.push( resolveGetter( arrays[ i ] ) );
out.push( [] );
}
// Extract each desired element from the provided arrays...
for ( i = 0; i < mask.length; i++ ) {
if ( mget( mask, i ) ) {
for ( j = 0; j < nargs; j++ ) {
out[ j ].push( getters[ j ]( arrays[ j ], i ) ); // use `Array#push` to ensure "fast" elements
}
}
}
return out;
}
// EXPORTS //
module.exports = mskfiltern;
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