PHP code example of purrphp / pure-collection

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

purrphp / pure-collection example snippets

$uuids = [];
$uuids[] = Uuid::fromInteger('1');
$uuids[] = '00000000-0000-0000-0000-000000000001'; // wrong type, no error

$uuids[] = Uuid::fromInteger('2');
$uuids['validUuid'] = Uuid::fromInteger('3');       // mixed int/string keys

use Purr\Collection\IntList;

$numbers = new IntList(1, 2, 3, 4, 5);

$even    = $numbers->filter(fn(int $n): bool => $n % 2 === 0);
$doubled = $numbers->map(fn(int $n): int => $n * 2); // returns array
$sum     = $numbers->reduce(fn(int $carry, int $n): int => $carry + $n, 0);
$sorted  = $numbers->sorted(fn(int $a, int $b): int => $b <=> $a);

$numbers->count();      // 5
$numbers->isEmpty();    // false
$numbers->isNotEmpty(); // true
$numbers->max();        // 5
$numbers->min();        // 1

use Purr\Collection\IntSet;
use Purr\Collection\StringSet;

$set = new IntSet(1, 2, 3, 2, 1); // duplicates are removed
$set->toArray();                   // [1, 2, 3]

$ids = IntSet::fromString('1,2,3', separator: ',');
$ids->join(',');                   // "1,2,3"

$tags = new StringSet('php', 'oop', 'php');
$tags->toArray();                  // ['php', 'oop']
$tags->sortedAlphabetically()->toArray(); // ['oop', 'php']

$a = new StringSet('a', 'b', 'c');
$b = new StringSet('b', 'c', 'd');
$a->diff($b)->toArray();           // ['a']

use Purr\Collection\IntMap;

$map = new IntMap(...['a' => 1, 'b' => 2, 'c' => 3]);

$map->filter(fn(int $v): bool => $v > 1)->toArray(); // ['b' => 2, 'c' => 3]
$map->groupBy(fn(int $v): string => $v % 2 === 0 ? 'even' : 'odd');

use Purr\Collection\AbstractSet;

/** @template-extends AbstractSet<\DateTimeImmutable> */
class DateTimeSet extends AbstractSet
{
    public function __construct(\DateTimeImmutable ...$dates)
    {
        parent::__construct($dates);
    }
     protected function isSupportedType(mixed $value): bool
    {
        return $value instanceof \DateTimeImmutable;
    }

    protected function getId(mixed $value): int|string
    {
        return $value->getTimeStamp();
    }
}