77 lines
1.7 KiB
JavaScript
77 lines
1.7 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 propertyDescriptor = require( '@stdlib/utils/property-descriptor' );
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// MAIN //
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/**
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* Tests if an object's own property is read-only.
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*
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* @param {*} value - value to test
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* @param {*} property - property to test
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* @returns {boolean} boolean indicating if an object property is read-only
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*
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* @example
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* var defineProperty = require( '@stdlib/utils/define-property' );
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*
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* var obj = {
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* 'boop': true
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* };
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*
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* defineProperty( obj, 'beep', {
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* 'configurable': false,
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* 'enumerable': true,
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* 'writable': false,
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* 'value': true
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* });
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*
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* var bool = isReadOnlyProperty( obj, 'boop' );
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* // returns false
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*
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* bool = isReadOnlyProperty( obj, 'beep' );
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* // returns true
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*/
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function isReadOnlyProperty( value, property ) {
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var desc = propertyDescriptor( value, property );
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return (
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desc !== null &&
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desc.configurable === false &&
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(
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// Data descriptor:
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desc.writable === false ||
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// Accessor descriptor:
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(
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typeof desc.get === 'function' &&
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desc.set === void 0
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)
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)
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);
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}
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// EXPORTS //
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module.exports = isReadOnlyProperty;
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