94 lines
2.1 KiB
JavaScript
94 lines
2.1 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var getOwnPropertySymbols = require( './../../property-symbols' );
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var getPrototypeOf = require( './../../get-prototype-of' );
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// FUNCTIONS //
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/**
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* Returns a boolean indicating if an array contains a provided value.
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*
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* @private
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* @param {Array} arr - array
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* @param {*} v - search value
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* @returns {boolean} boolean indicating if an array contains a search value
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*/
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function contains( arr, v ) {
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var i;
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for ( i = 0; i < arr.length; i++ ) {
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if ( arr[ i ] === v ) {
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return true;
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}
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}
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return false;
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}
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// MAIN //
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/**
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* Returns an array of an object's own and inherited symbol properties.
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*
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* ## Notes
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*
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* - In contrast to the built-in `Object.getOwnPropertySymbols()`, this function returns an empty array if provided `undefined` or `null`, rather than throwing an error.
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*
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* @param {*} value - input object
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* @returns {Array} a list of own and inherited symbol properties
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*
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* @example
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* var symbols = propertySymbolsIn( [] );
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*/
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function propertySymbolsIn( value ) {
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var symbols;
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var obj;
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var tmp;
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var i;
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if ( value === null || value === void 0 ) {
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return [];
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}
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// Cast the value to an object:
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obj = Object( value );
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// Walk the prototype chain collecting all symbol properties...
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symbols = [];
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do {
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tmp = getOwnPropertySymbols( obj );
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for ( i = 0; i < tmp.length; i++ ) {
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if ( contains( symbols, tmp[ i ] ) === false ) {
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symbols.push( tmp[ i ] );
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}
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}
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obj = getPrototypeOf( obj );
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} while ( obj );
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return symbols;
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}
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// EXPORTS //
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module.exports = propertySymbolsIn;
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