The Ds\Deque::map() function is an inbuilt function in PHP which is used to return the Deque with each element modified on the basis of operation performed as per the callback function.
Syntax:
public Ds\Deque::map( $callback ) : Ds\Deque
Parameters: This function accepts single parameter $callback which contains the callable function on the operation to be performed on each element of the Deque.
Return Value: This function returns a Deque with each element modified.
Below programs illustrate the Ds\Deque::map() function in PHP:
Program 1:
<?php   // Declare a Deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("Elements of deque\n");   // Display the Elements of Deque print_r($deck);   // Deque after mapping each value as // per in the callable function print_r($deck->map(function($element) {           // performing operation on each element     return $element * 10; }));   ?> |
Output:
Elements of deque
Ds\Deque Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
Ds\Deque Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
[5] => 60
)
Program 2:
<?php   // Declare a Deque $deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]);   echo("Elements of deque\n");   // Display the Elements of Deque print_r($deck);   // Deque after mapping each value as // per in the callable function print_r($deck->map(function($element) {           // performing operation on each element     return $element / 10; }));   ?> |
Output:
Elements of deque
Ds\Deque Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
[5] => 60
)
Ds\Deque Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
Reference: http://php.net/manual/en/ds-deque.map.php
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