PHP | Ds\Deque map() Function

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

<?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;
}));

?>

Program 2: PHP

<?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;
}));

?>

Reference: http://php.net/manual/en/ds-deque.map.php