main.js (1475B)
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 // MODULES // 22 23 var getOwnPropertySymbols = require( './../../property-symbols' ); 24 var isWritableProperty = require( '@stdlib/assert/is-writable-property' ); 25 26 27 // MAIN // 28 29 /** 30 * Returns an array of an object's own writable symbol properties. 31 * 32 * @param {*} value - input object 33 * @returns {Array} a list of own writable symbol properties 34 * 35 * @example 36 * var symbols = writablePropertySymbols( {} ); 37 */ 38 function writablePropertySymbols( value ) { 39 var symbols; 40 var i; 41 var n; 42 43 if ( value === null || value === void 0 ) { 44 return []; 45 } 46 symbols = getOwnPropertySymbols( Object( value ) ); 47 n = 0; 48 for ( i = 0; i < symbols.length; i++ ) { 49 if ( isWritableProperty( value, symbols[ i ] ) ) { 50 symbols[ n ] = symbols[ i ]; 51 n += 1; 52 } 53 } 54 symbols.length = n; 55 56 return symbols; 57 } 58 59 60 // EXPORTS // 61 62 module.exports = writablePropertySymbols;