74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 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 isCollection = require( '@stdlib/assert/is-collection' );
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var ctors = require( './../../ctors' );
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// MAIN //
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/**
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* Converts an array to an array of a different data type.
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*
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* @param {Collection} x - array to convert
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* @param {string} dtype - output data type
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* @throws {TypeError} first argument must be an array-like object
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* @throws {TypeError} second argument must be a recognized array data type
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* @returns {(Array|TypedArray)} output array
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*
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* @example
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* var arr = [ 1.0, 2.0, 3.0, 4.0 ];
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* var out = convert( arr, 'float64' );
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* // returns <Float64Array>[ 1.0, 2.0, 3.0, 4.0 ]
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*/
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function convert( x, dtype ) {
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var ctor;
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var out;
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var len;
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var i;
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if ( !isCollection( x ) ) {
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throw new TypeError( 'invalid argument. First argument must be an array-like object. Value: `' + x + '`.' );
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}
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len = x.length;
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ctor = ctors( dtype );
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if ( ctor === null ) {
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throw new TypeError( 'invalid argument. Second argument must be a recognized array data type. Value: `' + dtype + '`.' );
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}
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if ( dtype === 'generic' ) {
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out = [];
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for ( i = 0; i < len; i++ ) {
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out.push( x[ i ] ); // ensure "fast" elements
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}
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return out;
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}
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out = new ctor( len );
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for ( i = 0; i < len; i++ ) {
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out[ i ] = x[ i ];
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}
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return out;
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}
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// EXPORTS //
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module.exports = convert;
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