53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MAIN //
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/**
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* Returns a permutation of an input array according to a provided index array.
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*
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* @private
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* @param {Collection} x - input array
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* @param {NonNegativeIntegerArray} idx - permutation indices
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* @returns {Array} output array
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*
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* @example
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* var x = [ 1, 2, 3, 4 ];
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* var idx = [ 3, 1, 2, 0 ];
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*
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* var y = permute( x, idx );
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* // returns [ 4, 2, 3, 1 ]
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*/
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function permute( x, idx ) {
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var out;
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var i;
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out = [];
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for ( i = 0; i < x.length; i++ ) {
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out.push( x[ idx[ i ] ] );
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}
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return out;
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}
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// EXPORTS //
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module.exports = permute;
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