PHP - Ds Sequence reduce() Function

Ds\Sequence::reduce() function can reduce the sequence to a single value using a callback function.

Syntax

public abstract mixed Ds\Sequence::reduce( callable $callback [, mixed $initial ] )

Ds\Sequence::reduce() function can return the value of final callback.

Example 1

<?php
   $seq = new \Ds\Vector([1, 2, 3]);
   $callback = function($carry, $value) {
      return $carry * $value;
   };
   var_dump($seq->reduce($callback, 5));
?>

Example 2

<?php
   $seq = new \Ds\Vector([1, 2, 3]);
   
   var_dump($seq->reduce(function($carry, $value) {
      return $carry + $value + 5;
   }));
?>