time-to-botec

Benchmark sampling in different programming languages
Log | Files | Refs | README

main.js (3267B)

      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 isFunction = require( '@stdlib/assert/is-function' );
     24 var isCollection = require( '@stdlib/assert/is-collection' );
     25 var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
     26 var hasOwnProp = require( '@stdlib/assert/has-own-property' );
     27 
     28 
     29 // MAIN //
     30 
     31 /**
     32 * Creates (or fills) an array from an iterator.
     33 *
     34 * @param {Iterator} iterator - source iterator
     35 * @param {Collection} [out] - output array
     36 * @param {Function} [mapFcn] - function to invoke for each iterated value
     37 * @param {*} [thisArg] - execution context
     38 * @throws {TypeError} iterator argument must be an iterator
     39 * @throws {TypeError} callback argument must be a function
     40 * @returns {Collection} output array
     41 *
     42 * @example
     43 * var randu = require( '@stdlib/random/iter/randu' );
     44 *
     45 * var iter = randu({
     46 *     'iter': 10
     47 * });
     48 *
     49 * var arr = iterator2array( iter );
     50 * // returns <Array>
     51 */
     52 function iterator2array() {
     53 	var iterator;
     54 	var thisArg;
     55 	var fcn;
     56 	var out;
     57 	var len;
     58 	var i;
     59 	var v;
     60 
     61 	iterator = arguments[ 0 ];
     62 	if ( arguments.length > 1 ) {
     63 		if ( isCollection( arguments[ 1 ] ) ) {
     64 			out = arguments[ 1 ];
     65 			if ( arguments.length > 2 ) {
     66 				fcn = arguments[ 2 ];
     67 				if ( !isFunction( fcn ) ) {
     68 					throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + fcn + '`.' );
     69 				}
     70 				thisArg = arguments[ 3 ];
     71 			}
     72 		} else {
     73 			fcn = arguments[ 1 ];
     74 			if ( !isFunction( fcn ) ) {
     75 				throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + fcn + '`.' );
     76 			}
     77 			thisArg = arguments[ 2 ];
     78 		}
     79 	}
     80 	if ( !isIteratorLike( iterator ) ) {
     81 		throw new TypeError( 'invalid argument. Iterator argument must be an iterator protocol-compliant object. Value: `' + iterator + '`.' );
     82 	}
     83 	i = -1;
     84 	if ( out === void 0 ) {
     85 		out = [];
     86 		if ( fcn ) {
     87 			while ( true ) {
     88 				i += 1;
     89 				v = iterator.next();
     90 				if ( hasOwnProp( v, 'value' ) ) {
     91 					out.push( fcn.call( thisArg, v.value, i ) );
     92 				}
     93 				if ( v.done ) {
     94 					break;
     95 				}
     96 			}
     97 			return out;
     98 		}
     99 		while ( true ) {
    100 			v = iterator.next();
    101 			if ( hasOwnProp( v, 'value' ) ) {
    102 				out.push( v.value );
    103 			}
    104 			if ( v.done ) {
    105 				break;
    106 			}
    107 		}
    108 		return out;
    109 	}
    110 	len = out.length;
    111 	if ( fcn ) {
    112 		while ( i < len-1 ) {
    113 			i += 1;
    114 			v = iterator.next();
    115 			if ( hasOwnProp( v, 'value' ) ) {
    116 				out[ i ] = fcn.call( thisArg, v.value, i );
    117 			}
    118 			if ( v.done ) {
    119 				break;
    120 			}
    121 		}
    122 		return out;
    123 	}
    124 	while ( i < len-1 ) {
    125 		i += 1;
    126 		v = iterator.next();
    127 		if ( hasOwnProp( v, 'value' ) ) {
    128 			out[ i ] = v.value;
    129 		}
    130 		if ( v.done ) {
    131 			break;
    132 		}
    133 	}
    134 	return out;
    135 }
    136 
    137 
    138 // EXPORTS //
    139 
    140 module.exports = iterator2array;