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<?php
declare(strict_types=1);
namespace Stratadox\ImmutableCollection;
use function array_reduce;
use Closure;
/**
* Behaviour to allow "reducing" the immutable collection.
*
* Provides access to reduction behaviour in the form of a method that
* returns a reduced value based on the original collection.
* @package Stratadox\Collection
* @author Stratadox
*/
trait Reducing
{
* @see Reducible::reduce()
* @param Closure $function
* @param mixed $initial
* @return mixed
public function reduce(Closure $function, $initial = null)
return array_reduce($this->items(), $function, $initial);
}
/** @see Collection::items() */
abstract public function items(): array;
Stratadox /
ImmutableCollection
