from_edges_iterator_map.js (1487B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2021 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 25 26 // MAIN // 27 28 /** 29 * Returns an array of iterated values. 30 * 31 * @private 32 * @param {Object} it - iterator 33 * @param {Function} clbk - callback to invoke for each iterated value 34 * @param {*} thisArg - invocation context 35 * @returns {(Array|TypeError)} array or an error 36 */ 37 function fromIteratorMap( it, clbk, thisArg ) { 38 var out; 39 var v; 40 var z; 41 var i; 42 43 out = []; 44 i = -1; 45 while ( true ) { 46 i += 1; 47 v = it.next(); 48 z = v.value; 49 if ( z ) { 50 z = clbk.call( thisArg, z, i ); 51 if ( !isCollection( z ) ) { 52 return new TypeError( 'invalid argument. Callback must return an array-like object containing vertices. Value: `'+z+'`.' ); 53 } 54 out.push( z[ 0 ], z[ 1 ] ); 55 } 56 if ( v.done ) { 57 break; 58 } 59 } 60 return out; 61 } 62 63 64 // EXPORTS // 65 66 module.exports = fromIteratorMap;