pop_object.js (1225B)
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 * Removes and returns the last element of an array-like object. 25 * 26 * @private 27 * @param {Object} obj - input array-like object 28 * @returns {Array} input object and the removed element 29 * 30 * @example 31 * var obj = { 32 * 'length': 2, 33 * '0': 1.0, 34 * '1': 2.0 35 * }; 36 * 37 * var out = pop( obj ); 38 * // returns [ { 'length': 1, '0': 1.0 }, 2.0 ] 39 */ 40 function pop( obj ) { 41 var len; 42 var v; 43 if ( obj.length === 0 ) { 44 return [ obj, void 0 ]; 45 } 46 len = obj.length - 1; 47 v = obj[ len ]; 48 delete obj[ len ]; 49 obj.length = len; 50 return [ obj, v ]; 51 } 52 53 54 // EXPORTS // 55 56 module.exports = pop;