subtract.js (1216B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MAIN // 22 23 /** 24 * Computes an element-wise subtraction. 25 * 26 * @private 27 * @param {number} x - scalar minuend (implicitly broadcasted to full length array) 28 * @param {NumericArray} arr - array of subtrahends 29 * @returns {NumericArray} output array 30 * 31 * @example 32 * var x = 3; 33 * var arr = [ 1, 2, 2, 3 ]; 34 * 35 * var y = subtract( x, arr ); 36 * // returns [ 2, 1, 1, 0 ] 37 */ 38 function subtract( x, arr ) { 39 var len; 40 var res; 41 var i; 42 43 len = arr.length; 44 res = new Array( len ); 45 for ( i = 0; i < len; i++ ) { 46 res[ i ] = x - arr[ i ]; 47 } 48 49 return res; 50 } 51 52 53 // EXPORTS // 54 55 module.exports = subtract;