141 lines
3.2 KiB
JavaScript
141 lines
3.2 KiB
JavaScript
/**
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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 isFunction = require( '@stdlib/assert/is-function' );
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var isCollection = require( '@stdlib/assert/is-collection' );
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var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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// MAIN //
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/**
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* Creates (or fills) an array from an iterator.
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*
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* @param {Iterator} iterator - source iterator
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* @param {Collection} [out] - output array
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* @param {Function} [mapFcn] - function to invoke for each iterated value
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* @param {*} [thisArg] - execution context
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* @throws {TypeError} iterator argument must be an iterator
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* @throws {TypeError} callback argument must be a function
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* @returns {Collection} output array
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*
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* @example
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* var randu = require( '@stdlib/random/iter/randu' );
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*
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* var iter = randu({
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* 'iter': 10
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* });
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*
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* var arr = iterator2array( iter );
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* // returns <Array>
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*/
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function iterator2array() {
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var iterator;
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var thisArg;
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var fcn;
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var out;
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var len;
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var i;
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var v;
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iterator = arguments[ 0 ];
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if ( arguments.length > 1 ) {
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if ( isCollection( arguments[ 1 ] ) ) {
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out = arguments[ 1 ];
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if ( arguments.length > 2 ) {
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fcn = arguments[ 2 ];
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if ( !isFunction( fcn ) ) {
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throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + fcn + '`.' );
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}
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thisArg = arguments[ 3 ];
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}
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} else {
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fcn = arguments[ 1 ];
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if ( !isFunction( fcn ) ) {
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throw new TypeError( 'invalid argument. Callback argument must be a function. Value: `' + fcn + '`.' );
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}
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thisArg = arguments[ 2 ];
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}
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}
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if ( !isIteratorLike( iterator ) ) {
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throw new TypeError( 'invalid argument. Iterator argument must be an iterator protocol-compliant object. Value: `' + iterator + '`.' );
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}
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i = -1;
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if ( out === void 0 ) {
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out = [];
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if ( fcn ) {
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while ( true ) {
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i += 1;
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v = iterator.next();
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if ( hasOwnProp( v, 'value' ) ) {
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out.push( fcn.call( thisArg, v.value, i ) );
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}
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if ( v.done ) {
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break;
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}
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}
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return out;
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}
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while ( true ) {
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v = iterator.next();
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if ( hasOwnProp( v, 'value' ) ) {
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out.push( v.value );
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}
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if ( v.done ) {
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break;
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}
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}
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return out;
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}
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len = out.length;
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if ( fcn ) {
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while ( i < len-1 ) {
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i += 1;
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v = iterator.next();
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if ( hasOwnProp( v, 'value' ) ) {
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out[ i ] = fcn.call( thisArg, v.value, i );
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}
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if ( v.done ) {
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break;
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}
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}
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return out;
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}
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while ( i < len-1 ) {
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i += 1;
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v = iterator.next();
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if ( hasOwnProp( v, 'value' ) ) {
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out[ i ] = v.value;
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}
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if ( v.done ) {
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break;
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}
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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 = iterator2array;
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