main.js (1969B)
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 getPrototypeOf = require( './../../get-prototype-of' ); 25 var isNonEnumerableProperty = require( '@stdlib/assert/is-nonenumerable-property' ); 26 var hasOwnProp = require( '@stdlib/assert/has-own-property' ); 27 28 29 // MAIN // 30 31 /** 32 * Returns an array of an object's own and inherited non-enumerable symbol properties. 33 * 34 * @param {*} value - input object 35 * @returns {Array} a list of own and inherited non-enumerable symbol properties 36 * 37 * @example 38 * var symbols = nonEnumerablePropertySymbolsIn( {} ); 39 */ 40 function nonEnumerablePropertySymbolsIn( value ) { // eslint-disable-line id-length 41 var symbols; 42 var cache; 43 var obj; 44 var tmp; 45 var k; 46 var i; 47 48 if ( value === null || value === void 0 ) { 49 return []; 50 } 51 // Cast the value to an object: 52 obj = Object( value ); 53 54 // Walk the prototype chain collecting all non-enumerable symbol properties... 55 symbols = []; 56 cache = {}; 57 do { 58 tmp = getOwnPropertySymbols( obj ); 59 for ( i = 0; i < tmp.length; i++ ) { 60 k = tmp[ i ]; 61 if ( 62 hasOwnProp( cache, k ) === false && 63 isNonEnumerableProperty( obj, k ) 64 ) { 65 symbols.push( k ); 66 } 67 cache[ k ] = true; 68 } 69 obj = getPrototypeOf( obj ); 70 } while ( obj ); 71 72 return symbols; 73 } 74 75 76 // EXPORTS // 77 78 module.exports = nonEnumerablePropertySymbolsIn;