horat1us/map-iterator

Map Iterator Implementation

1.0.1 2021-08-16 11:09 UTC

This package is auto-updated.

Last update: 2024-11-16 18:38:38 UTC


README

Latest Stable Version Total Downloads codecov Test Package

Русская документация

Iterators to map inner iterator values before yielding.

Inspired by \FilterIterator and \CallbackFilterIterator.

Installation

Using composer

composer require horat1us/map-iterator:^1.0

Usage

MapIterator

Maps values before yielding using abstract method.

See ./example/map-iterator.php

<?php

use Horat1us\Util\MapIterator;

class IntegerPlusOneInterator extends MapIterator
{
    public function map($item)
    {
        if (!is_int($item)) {
            throw new \InvalidArgumentException("Unable map not-integer item.");
        }
        return $item + 1;
    }
}

$numbers = [1,2,3];
$iterator = new IntegerPlusOneInterator(new \ArrayIterator($numbers));
print_r(iterator_to_array($iterator)); // Array ( [0] => 2, [1] => 3, [2] => 4 )

CallbackMapIterator (recommended)

Maps values before yielding using callback.

See ./example/map-iterator.php

<?php

use Horat1us\Util\CallbackMapIterator;

$numbers = [1,2,3];
$powCallback = static fn(int $number) => pow($number, $number);
$iterator = new CallbackMapIterator(new \ArrayIterator($numbers), $powCallback);

print_r(iterator_to_array($iterator)); // Array ( [0] => 1, [1] => 4, [2] => 27 )

License

BSD 3