from_iterator_map.js (1813B)
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 isArrayLikeObject = require( '@stdlib/assert/is-array-like-object' ); 24 var isComplexLike = require( '@stdlib/assert/is-complex-like' ); 25 var real = require( '@stdlib/complex/real' ); 26 var imag = require( '@stdlib/complex/imag' ); 27 28 29 // MAIN // 30 31 /** 32 * Returns an array of iterated values. 33 * 34 * @private 35 * @param {Object} it - iterator 36 * @param {Function} clbk - callback to invoke for each iterated value 37 * @param {*} thisArg - invocation context 38 * @returns {(Array|TypeError)} array or an error 39 */ 40 function fromIteratorMap( it, clbk, thisArg ) { 41 var out; 42 var v; 43 var z; 44 var i; 45 46 out = []; 47 i = -1; 48 while ( true ) { 49 i += 1; 50 v = it.next(); 51 z = v.value; 52 if ( z ) { 53 z = clbk.call( thisArg, z, i ); 54 if ( isArrayLikeObject( z ) && z.length >= 2 ) { 55 out.push( z[ 0 ], z[ 1 ] ); 56 } else if ( isComplexLike( z ) ) { 57 out.push( real( z ), imag( z ) ); 58 } else { 59 return new TypeError( 'invalid argument. Callback must return either a two-element array containing real and imaginary components or a complex number. Value: `'+z+'`.' ); 60 } 61 } 62 if ( v.done ) { 63 break; 64 } 65 } 66 return out; 67 } 68 69 70 // EXPORTS // 71 72 module.exports = fromIteratorMap;