74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 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 isDataView = require( './../../is-dataview' );
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var ArrayBuffer = require( '@stdlib/array/buffer' );
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var GlobalDataView = require( './dataview.js' );
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// MAIN //
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/**
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* Tests for native `DataView` support.
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*
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* @returns {boolean} boolean indicating if an environment has `DataView` support
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*
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* @example
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* var bool = hasDataViewSupport();
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* // returns <boolean>
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*/
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function hasDataViewSupport() {
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var bool;
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var view;
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var buf;
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if ( typeof GlobalDataView !== '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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buf = new ArrayBuffer( 24 );
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view = new GlobalDataView( buf, 8 );
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bool = ( isDataView( view ) && typeof view.getFloat64 === 'function' && typeof view.setFloat64 === 'function' );
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if ( bool ) {
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view.setFloat64( 0, -3.14 );
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view.setFloat64( 8, NaN );
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bool = (
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bool &&
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view.buffer === buf &&
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view.byteLength === 16 &&
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view.byteOffset === 8 &&
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view.getFloat64( 0 ) === -3.14 &&
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view.getFloat64( 8 ) !== view.getFloat64( 8 )
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);
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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 = hasDataViewSupport;
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