All files / assert/is-writable-property-in/lib main.js

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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 propertyDescriptorIn = require( '@stdlib/utils/property-descriptor-in' );
 
 
// MAIN //
 
/**
* Tests if an object's own or inherited property is writable.
*
* @param {*} value - value to test
* @param {*} property - property to test
* @returns {boolean} boolean indicating if an object property is writable
*
* @example
* var defineProperty = require( '@stdlib/utils/define-property' );
*
* var obj = {
*     'boop': true
* };
*
* defineProperty( obj, 'beep', {
*     'configurable': false,
*     'enumerable': false,
*     'writable': false,
*     'value': 'beep'
* });
*
* var bool = isWritablePropertyIn( obj, 'boop' );
* // returns true
*
* bool = isWritablePropertyIn( obj, 'beep' );
* // returns false
*/
function isWritablePropertyIn( value, property ) {
	var desc = propertyDescriptorIn( value, property );
	return (
		desc !== null &&
		(
			desc.writable === true ||
			typeof desc.set === 'function'
		)
	);
}
 
 
// EXPORTS //
 
module.exports = isWritablePropertyIn;