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<?php declare(strict_types=1); namespace Psl\Iter; use Closure; /** * Reduces an iterable to a single value. * * The reduction function is passed an accumulator value and the current * iterator value and returns a new accumulator. The accumulator is initialized * to $initial. * * @template T * @template Ts * * @param iterable<T> $iterable * @param (Closure(Ts, T): Ts) $function * @param Ts $initial * * @return Ts */ function reduce(iterable $iterable, Closure $function, mixed $initial): mixed { $accumulator = $initial; foreach ($iterable as $v) { $accumulator = $function($accumulator, $v); } return $accumulator; }