main.js (1782B)
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 propertyDescriptorIn = require( '@stdlib/utils/property-descriptor-in' ); 24 25 26 // MAIN // 27 28 /** 29 * Tests if an object's own or inherited property is readable and writable. 30 * 31 * @param {*} value - value to test 32 * @param {*} property - property to test 33 * @returns {boolean} boolean indicating if an object property is readable and writable 34 * 35 * @example 36 * var defineProperty = require( '@stdlib/utils/define-property' ); 37 * 38 * var obj = { 39 * 'boop': true 40 * }; 41 * 42 * function setter( v ) { 43 * obj.boop = v; 44 * } 45 * 46 * defineProperty( obj, 'beep', { 47 * 'configurable': false, 48 * 'enumerable': false, 49 * 'set': setter 50 * }); 51 * 52 * var bool = isReadWritePropertyIn( obj, 'boop' ); 53 * // returns true 54 * 55 * bool = isReadWritePropertyIn( obj, 'beep' ); 56 * // returns false 57 */ 58 function isReadWritePropertyIn( value, property ) { 59 var desc = propertyDescriptorIn( value, property ); 60 return ( 61 desc !== null && 62 ( 63 // Data descriptor: 64 desc.writable === true || 65 66 // Accessor descriptor: 67 ( 68 typeof desc.get === 'function' && 69 typeof desc.set === 'function' 70 ) 71 ) 72 ); 73 } 74 75 76 // EXPORTS // 77 78 module.exports = isReadWritePropertyIn;