PHP | Ds\Deque::reduce() Function

PHP Ds\Deque::reduce() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP Ds Deque reduce() Function.

The built-in Ds Deque reduce() function in PHP reduces the deque down to a single value using a callback function.

Syntax

Following below is the syntax to use this function -

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


Return Value

This built-in PHP function returns a value of final callback.

Example1

Try out the below example -

<?php 
   $deque = new \Ds\Deque([10, 20, 30, 40, 50]); 
   echo("The elements in deque: \n"); 
   print_r($deque); 
   
   $func = function($carry, $element) { 
      return $carry + $element; 
   }; 
   echo("\n The deque after reduced into single element:");   
   var_dump($deque->reduce($func, 3)); 
?>

Example2

Try the following example -

<?php 
   $deque = new \Ds\Deque([10, 20, 30, 40, 50]); 
   echo("The elements in deque: \n"); 
   print_r($deque); 
   
   $func = function($carry, $element) { 
      return $carry * $element + 30; 
   }; 
   echo("\n The deque after reduced into single element:"); 
   var_dump($deque->reduce($func, 10)); 
?>


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the Ds Deque remove() Function in PHP.

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