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‎.docheader‎

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/**
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* This file is part of php-fast-forward/iterators.
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*
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* This source file is subject to the license that is bundled
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* with this source code in the file LICENSE.
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*
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* @link https://github.com/php-fast-forward/iterators
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* @copyright Copyright (c) 2025-%year% Felipe Sayão Lobato Abreu <[email protected]>
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* @license https://opensource.org/licenses/MIT MIT License
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*/

‎.editorconfig‎

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root = true
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[*]
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indent_style = space
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indent_size = 4
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end_of_line = lf
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charset = utf-8
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trim_trailing_whitespace = true
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insert_final_newline = true
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[*.md]
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trim_trailing_whitespace = false

‎.gitattributes‎

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* text=auto
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/.github/ export-ignore
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/tests/ export-ignore
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/.docheader export-ignore
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/.dockerignore export-ignore
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/.editorconfig export-ignore
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/.gitattributes export-ignore
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/.gitignore export-ignore
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/.php-cs-fixer.php export-ignore
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/docker-compose export-ignore
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/Dockerfile export-ignore
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/infection.json5 export-ignore
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/phpunit.xml export-ignore

‎.gitignore‎

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.idea/
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public/
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vendor/
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composer.lock
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*.cache

‎.php-cs-fixer.php‎

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<?php
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declare(strict_types=1);
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/**
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* This file is part of php-fast-forward/iterators.
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*
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* This source file is subject to the license that is bundled
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* with this source code in the file LICENSE.
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*
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* @link https://github.com/php-fast-forward/iterators
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* @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <[email protected]>
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* @license https://opensource.org/licenses/MIT MIT License
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*/
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use CoiSA\PhpCsFixer\PhpCsFixer;
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$paths = [
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__FILE__,
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__DIR__,
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];
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$header = file_get_contents(__DIR__ . '/.docheader');
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return PhpCsFixer::create($paths, $header);

‎LICENSE‎

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Copyright (c) 2025 Felipe Sayão Lobato Abreu
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is furnished
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to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎composer.json‎

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{
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"name": "fast-forward/iterators",
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"description": "A robust and optimized library for advanced PHP Iterators.",
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"license": "MIT",
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"type": "library",
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"keywords": [
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"php",
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"iterators",
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"iterator utilities",
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"iterator aggregate",
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"iterator iterator",
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"fast-forward"
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],
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"authors": [
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{
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"name": "Felipe Sayão Lobato Abreu",
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"email": "[email protected]"
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}
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],
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"homepage": "https://github.com/php-fast-forward",
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"support": {
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"issues": "https://github.com/php-fast-forward/iterators/issues",
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"source": "https://github.com/php-fast-forward/iterators"
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},
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"require": {
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"php": "^7.4 || ^8.0"
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},
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"require-dev": {
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"coisa/php-cs-fixer": "^2.1",
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"infection/infection": "^0.29",
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"phpstan/phpstan": "^2.1",
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"phpunit/phpunit": "^9.6 || ^10.5 || ^11.5"
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},
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"minimum-stability": "stable",
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"autoload": {
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"psr-4": {
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"FastForward\\Iterator\\": "src/"
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},
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"files": [
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"src/functions.php"
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]
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},
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"config": {
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"allow-plugins": {
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"infection/extension-installer": true
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},
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"sort-packages": true
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},
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"extra": {
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"branch-alias": {
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"dev-main": "1.x-dev"
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}
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},
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"scripts": {
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"cs-check": "php-cs-fixer fix --dry-run --diff",
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"cs-fix": "php-cs-fixer fix",
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"mutation-testing": "infection --threads=4",
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"pre-commit": [
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"@cs-check",
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"@static-analysis",
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"@tests"
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],
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"static-analysis": "phpstan analyse --level 5 src",
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"tests": "phpunit --testdox"
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}
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}

‎examples/chunked-iterator-aggregate.php‎

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<?php
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declare(strict_types=1);
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/**
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* This file is part of php-fast-forward/iterators.
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*
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* This source file is subject to the license that is bundled
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* with this source code in the file LICENSE.
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*
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* @link https://github.com/php-fast-forward/iterators
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* @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <[email protected]>
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* @license https://opensource.org/licenses/MIT MIT License
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*/
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use FastForward\Iterator\ChunkedIteratorAggregate;
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use function FastForward\Iterator\debugIterable;
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require_once dirname(__DIR__) . '/vendor/autoload.php';
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/**
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* Sample dataset to be chunked.
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*
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* @var array<int, int> $data
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*/
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$data = range(1, 10);
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/**
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* Creates a ChunkedIteratorAggregate with a chunk size of 3.
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*
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* This splits the data into subarrays of at most 3 elements each.
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*
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* @var ChunkedIteratorAggregate<int> $chunkedIterator
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*/
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$chunkedIterator = new ChunkedIteratorAggregate($data, 3);
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/**
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* Creates a ChunkedIteratorAggregate with a chunk size of 4.
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*
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* This demonstrates how different chunk sizes affect iteration.
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*
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* @var ChunkedIteratorAggregate<int> $chunkedIteratorFour
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*/
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$chunkedIteratorFour = new ChunkedIteratorAggregate(new ArrayIterator($data), 4);
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// Debugging the ChunkedIteratorAggregate output.
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debugIterable($chunkedIterator, 'ChunkedIteratorAggregate :: Chunk size 3');
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debugIterable($chunkedIteratorFour, 'ChunkedIteratorAggregate :: Chunk size 4');

‎examples/closure-factory-iterator-aggregate.php‎

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<?php
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declare(strict_types=1);
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/**
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* This file is part of php-fast-forward/iterators.
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*
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* This source file is subject to the license that is bundled
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* with this source code in the file LICENSE.
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*
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* @link https://github.com/php-fast-forward/iterators
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* @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <[email protected]>
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* @license https://opensource.org/licenses/MIT MIT License
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*/
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use FastForward\Iterator\ClosureFactoryIteratorAggregate;
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use function FastForward\Iterator\debugIterable;
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require_once dirname(__DIR__) . '/vendor/autoload.php';
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$len = 5;
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/**
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* Generator function to produce values dynamically.
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*
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* @param int $len the number of values to generate
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*
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* @return Generator<int, string> a generator yielding formatted strings
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*/
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$generatorFactory = static function (int $len = 10) {
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for ($i = 0; $i < $len; ++$i) {
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yield 'Value: ' . ($i + $len);
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}
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};
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/**
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* Array-based factory to showcase alternative iteration strategy.
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*
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* @param int $len the number of values to include
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*
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* @return ArrayIterator<int, string> an ArrayIterator wrapping a static array
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*/
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$arrayFactory = static fn (int $len = 10) => new ArrayIterator(array_map(static fn ($i) => 'Value: ' . ($i + $len), range(0, $len - 1)));
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// Using ClosureFactoryIteratorAggregate with a Generator function
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$generatorIterator = new ClosureFactoryIteratorAggregate(static fn () => $generatorFactory($len));
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// or
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// $generatorIterator = new ClosureFactoryIteratorAggregate($generatorFactory);
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// Using ClosureFactoryIteratorAggregate with an ArrayIterator
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$arrayIterator = new ClosureFactoryIteratorAggregate(static fn () => $arrayFactory($len));
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debugIterable(
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$generatorIterator,
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'ClosureFactoryIteratorAggregate :: Generator Strategy :: First Iteration',
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);
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debugIterable(
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$generatorIterator,
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'ClosureFactoryIteratorAggregate :: Generator Strategy :: Second Iteration',
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);
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debugIterable(
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$arrayIterator,
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'ClosureFactoryIteratorAggregate :: ArrayIterator Strategy :: First Iteration',
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);
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debugIterable(
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$arrayIterator,
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'ClosureFactoryIteratorAggregate :: ArrayIterator Strategy :: Second Iteration',
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);

‎examples/closure-iterator-iterator.php‎

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<?php
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declare(strict_types=1);
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/**
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* This file is part of php-fast-forward/iterators.
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*
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* This source file is subject to the license that is bundled
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* with this source code in the file LICENSE.
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*
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* @link https://github.com/php-fast-forward/iterators
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* @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <[email protected]>
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* @license https://opensource.org/licenses/MIT MIT License
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*/
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use FastForward\Iterator\ClosureIteratorIterator;
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use function FastForward\Iterator\debugIterable;
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require_once dirname(__DIR__) . '/vendor/autoload.php';
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$data = [1, 2, 3, 4, 5];
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/**
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* Creates a ClosureIteratorIterator that doubles each value in an iterable.
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*
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* @param array<int, int> $data the array of integers to iterate over
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*
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* @return ClosureIteratorIterator<int, int> the transformed iterator
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*/
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$doubleIterator = new ClosureIteratorIterator(
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new ArrayIterator($data),
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static fn (int $value): int => $value * 2
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);
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/**
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* Creates a ClosureIteratorIterator that transforms numbers into their string representations.
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*
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* @param array<int, int> $data the array of integers to iterate over
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*
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* @return ClosureIteratorIterator<int, string> the transformed iterator
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*/
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$stringIterator = new ClosureIteratorIterator(
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new ArrayIterator($data),
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static fn (int $value): string => "Number {$value}"
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);
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// Running test iterations
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debugIterable($doubleIterator, 'ClosureIteratorIterator :: Doubling values');
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debugIterable($stringIterator, 'ClosureIteratorIterator :: Converting to strings');

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