64 lines
1.3 KiB
JavaScript
64 lines
1.3 KiB
JavaScript
/**
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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 GlobalWeakMap = require( './weakmap.js' );
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// MAIN //
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/**
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* Tests for native `WeakMap` support.
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*
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* @returns {boolean} boolean indicating if an environment has `WeakMap` support
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*
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* @example
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* var bool = hasWeakMapSupport();
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* // returns <boolean>
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*/
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function hasWeakMapSupport() {
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var bool;
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var key;
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var wm;
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if ( typeof GlobalWeakMap !== 'function' ) {
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return false;
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}
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// Test basic support...
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try {
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key = {};
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wm = new GlobalWeakMap();
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wm.set( key, 'beep' );
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bool = (
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wm.has( key ) &&
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wm.get( key ) === 'beep'
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);
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} catch ( err ) { // eslint-disable-line no-unused-vars
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bool = false;
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}
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return bool;
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}
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// EXPORTS //
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module.exports = hasWeakMapSupport;
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