101 lines
2.7 KiB
JavaScript
101 lines
2.7 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 propertyNames = require( './../../property-names' );
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var propertySymbols = require( './../../property-symbols' );
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var propertyDescriptor = require( './../../property-descriptor' );
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var defineProperty = require( './../../define-property' );
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// MAIN //
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/**
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* Returns an object's own property descriptors.
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*
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* ## Notes
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*
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* - In contrast to the built-in `Object.getOwnPropertyDescriptors()`, this function returns an empty object if provided `undefined` or `null`, rather than throwing an error.
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*
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* @private
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* @param {*} value - input object
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* @returns {Object} property descriptors
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*
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* @example
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* var obj = {
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* 'beep': 'boop',
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* 'foo': 3.14
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* };
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*
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* var desc = getOwnPropertyDescriptors( obj, 'foo' );
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* // returns {...}
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*/
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function getOwnPropertyDescriptors( value ) {
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var symbols;
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var names;
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var desc;
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var out;
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var i;
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out = {};
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// Get the value's own enumerable and non-enumerable properties:
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names = propertyNames( value );
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// For each property name, retrieve the property descriptor...
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for ( i = 0; i < names.length; i++ ) {
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desc = propertyDescriptor( value, names[ i ] );
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if ( desc ) {
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// The following is equivalent to `out[ names[i] ] = desc`, but accounts for the possibility of a "poisoned" `Object` prototype (i.e., an `Object.prototype` having a property with a setter which throws).
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defineProperty( out, names[ i ], {
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'configurable': true,
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'enumerable': true,
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'writable': true,
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'value': desc
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});
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}
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}
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// Get the value's symbol properties:
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symbols = propertySymbols( value );
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// For each symbol property, retrieve the property descriptor...
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for ( i = 0; i < symbols.length; i++ ) {
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desc = propertyDescriptor( value, symbols[ i ] );
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if ( desc ) {
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// The following is equivalent to `out[ symbols[i] ] = desc`, but accounts for the possibility of a "poisoned" `Object` prototype (i.e., an `Object.prototype` having a property with a setter which throws).
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defineProperty( out, symbols[ i ], {
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'configurable': true,
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'enumerable': true,
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'writable': true,
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'value': desc
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});
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}
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}
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return out;
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}
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// EXPORTS //
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module.exports = getOwnPropertyDescriptors;
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