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