main.js (1653B)
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 propertyNames = require( './../../property-names' ); 24 var propertySymbols = require( './../../property-symbols' ); 25 var isWritable = require( '@stdlib/assert/is-writable-property' ); 26 27 28 // MAIN // 29 30 /** 31 * Returns an array of an object's own writable property names and symbols. 32 * 33 * @param {*} value - input object 34 * @returns {Array} a list of own property writable names and symbols 35 * 36 * @example 37 * var obj = { 38 * 'beep': 'boop', 39 * 'foo': 3.14 40 * }; 41 * 42 * var props = writableProperties( obj ); 43 * // e.g., returns [ 'beep', 'foo' ] 44 */ 45 function writableProperties( value ) { 46 var out; 47 var tmp; 48 var n; 49 var i; 50 51 out = propertyNames( value ); 52 n = 0; 53 for ( i = 0; i < out.length; i++ ) { 54 if ( isWritable( value, out[ i ] ) ) { 55 out[ n ] = out[ i ]; 56 n += 1; 57 } 58 } 59 out.length = n; 60 61 tmp = propertySymbols( value ); 62 for ( i = 0; i < tmp.length; i++ ) { 63 if ( isWritable( value, tmp[ i ] ) ) { 64 out.push( tmp[ i ] ); 65 } 66 } 67 return out; 68 } 69 70 71 // EXPORTS // 72 73 module.exports = writableProperties;