main.js (1927B)
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 isCollection = require( '@stdlib/assert/is-collection' ); 24 var ctors = require( './../../ctors' ); 25 26 27 // MAIN // 28 29 /** 30 * Converts an array to an array of a different data type. 31 * 32 * @param {Collection} x - array to convert 33 * @param {string} dtype - output data type 34 * @throws {TypeError} first argument must be an array-like object 35 * @throws {TypeError} second argument must be a recognized array data type 36 * @returns {(Array|TypedArray)} output array 37 * 38 * @example 39 * var arr = [ 1.0, 2.0, 3.0, 4.0 ]; 40 * var out = convert( arr, 'float64' ); 41 * // returns <Float64Array>[ 1.0, 2.0, 3.0, 4.0 ] 42 */ 43 function convert( x, dtype ) { 44 var ctor; 45 var out; 46 var len; 47 var i; 48 if ( !isCollection( x ) ) { 49 throw new TypeError( 'invalid argument. First argument must be an array-like object. Value: `' + x + '`.' ); 50 } 51 len = x.length; 52 ctor = ctors( dtype ); 53 if ( ctor === null ) { 54 throw new TypeError( 'invalid argument. Second argument must be a recognized array data type. Value: `' + dtype + '`.' ); 55 } 56 if ( dtype === 'generic' ) { 57 out = []; 58 for ( i = 0; i < len; i++ ) { 59 out.push( x[ i ] ); // ensure "fast" elements 60 } 61 return out; 62 } 63 out = new ctor( len ); 64 for ( i = 0; i < len; i++ ) { 65 out[ i ] = x[ i ]; 66 } 67 return out; 68 } 69 70 71 // EXPORTS // 72 73 module.exports = convert;