The Ds\Deque::reduce() function is an inbuilt function in PHP which is used to reduce the Deque to a single element using callback function.
public Ds\Deque::reduce( $callback, $initial ) : mixed
Parameters: This function accept two parameters as mentioned above and described below:
- callable: It contains the operation to be performed on the elements of Deque resulting into a single element.
- value: It holds the initial value of carry which will be the result after performing operation on all elements.
Return Value: This function returns the final value returned by the callback function.
Below programs illustrate the Ds\Deque::reduce() function in PHP:
Elements of Deque Ds\Deque Object (  => 10  => 20  => 30  => 40  => 50  => 60 ) Deque after reduced into single element: int(215)
Elements of Deque Ds\Deque Object (  => 10  => 20  => 30  => 40  => 50  => 60 ) Deque after reduced into single element: int(8714461220)
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