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* @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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
// MAIN //
/**
* Returns a property descriptor for an object's own property.
*
* ## Notes
*
* - In contrast to the built-in `Object.getOwnPropertyDescriptor()`, this function returns `null` if provided `undefined` or `null`, rather than throwing an error.
* - In contrast to the built-in `Object.getOwnPropertyDescriptor()`, this function returns `null` if an object does not have a provided property, rather than `undefined`.
* - In environments lacking `Object.getOwnPropertyDescriptor()` support, property descriptors do not exist. In non-supporting environment, if an object has a provided property, this function returns a descriptor object equivalent to that returned in a supporting environment; otherwise, the function returns `null`.
*
* @private
* @param {*} value - input object
* @param {(string|symbol)} property - property
* @returns {(Object|null)} property descriptor or null
*
* @example
* var obj = {
* 'beep': 'boop',
* 'foo': 3.14
* };
*
* var desc = getOwnPropertyDescriptor( obj, 'foo' );
* // returns {'configurable':true,'enumerable':true,'writable':true,'value':3.14}
*/
function getOwnPropertyDescriptor( value, property ) {
if ( hasOwnProp( value, property ) ) {
return {
'configurable': true,
'enumerable': true,
'writable': true,
'value': value[ property ]
};
}
return null;
}
// EXPORTS //
module.exports = getOwnPropertyDescriptor;
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