main.js (1646B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isInt32Array = require( './../../is-int32array' ); 24 var INT32_MAX = require( '@stdlib/constants/int32/max' ); 25 var INT32_MIN = require( '@stdlib/constants/int32/min' ); 26 var GlobalInt32Array = require( './int32array.js' ); 27 28 29 // MAIN // 30 31 /** 32 * Tests for native `Int32Array` support. 33 * 34 * @returns {boolean} boolean indicating if an environment has `Int32Array` support 35 * 36 * @example 37 * var bool = hasInt32ArraySupport(); 38 * // returns <boolean> 39 */ 40 function hasInt32ArraySupport() { 41 var bool; 42 var arr; 43 44 if ( typeof GlobalInt32Array !== 'function' ) { 45 return false; 46 } 47 // Test basic support... 48 try { 49 arr = new GlobalInt32Array( [ 1, 3.14, -3.14, INT32_MAX+1 ] ); 50 bool = ( 51 isInt32Array( arr ) && 52 arr[ 0 ] === 1 && 53 arr[ 1 ] === 3 && // truncation 54 arr[ 2 ] === -3 && // truncation 55 arr[ 3 ] === INT32_MIN // wrap around 56 ); 57 } catch ( err ) { // eslint-disable-line no-unused-vars 58 bool = false; 59 } 60 return bool; 61 } 62 63 64 // EXPORTS // 65 66 module.exports = hasInt32ArraySupport;