72 lines
1.7 KiB
JavaScript
72 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) 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 isBigInt64Array = require( './../../is-bigint64array' );
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var isBigInt = require( './../../is-bigint' );
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var GlobalBigInt64Array = require( './bigint64array.js' );
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// VARIABLES //
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var MAX_FLOAT64_INTEGER = '9007199254740991'; // 2^53-1
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var MAX_FLOAT64_INTEGER_P2 = '9007199254740993';
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// MAIN //
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/**
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* Tests for native `BigInt64Array` support.
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*
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* @returns {boolean} boolean indicating if an environment has `BigInt64Array` support
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*
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* @example
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* var bool = hasBigInt64ArraySupport();
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* // returns <boolean>
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*/
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function hasBigInt64ArraySupport() {
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var arr;
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if ( typeof GlobalBigInt64Array !== '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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arr = new GlobalBigInt64Array([
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MAX_FLOAT64_INTEGER,
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MAX_FLOAT64_INTEGER_P2
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]);
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return (
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isBigInt64Array( arr ) &&
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isBigInt( arr[ 0 ] ) &&
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arr[ 0 ].toString() === MAX_FLOAT64_INTEGER &&
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isBigInt( arr[ 1 ] ) &&
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arr[ 1 ].toString() === MAX_FLOAT64_INTEGER_P2
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);
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} catch ( err ) { // eslint-disable-line no-unused-vars
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return false;
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}
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}
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// EXPORTS //
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module.exports = hasBigInt64ArraySupport;
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