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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 isArrayBuffer = require( '@stdlib/assert/is-arraybuffer' );
var Float64Array = require( '@stdlib/array/float64' );
var GlobalArrayBuffer = require( './arraybuffer.js' );
// MAIN //
/**
* Tests for native `ArrayBuffer` support.
*
* @returns {boolean} boolean indicating if an environment has `ArrayBuffer` support
*
* @example
* var bool = hasArrayBufferSupport();
* // returns <boolean>
*/
function hasArrayBufferSupport() {
var bool;
var view;
var buf;
if ( typeof GlobalArrayBuffer !== 'function' ) {
return false;
}
// Test basic support...
try {
buf = new GlobalArrayBuffer( 16 );
bool = ( isArrayBuffer( buf ) && typeof GlobalArrayBuffer.isView === 'function' );
if ( bool ) {
view = new Float64Array( buf );
view[ 0 ] = -3.14;
view[ 1 ] = NaN;
bool = (
bool &&
GlobalArrayBuffer.isView( view ) &&
buf.byteLength === 16 &&
view[ 0 ] === -3.14 &&
view[ 1 ] !== view[ 1 ]
);
}
} catch ( err ) { // eslint-disable-line no-unused-vars
bool = false;
}
return bool;
}
// EXPORTS //
module.exports = hasArrayBufferSupport;
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