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Ds\Deque::map

(PECL ds >= 1.0.0)

Ds\Deque::mapReturns the result of applying a callback to each value.

Description

public Ds\Deque Ds\Deque::map ( callable $callback )

Returns the result of applying a callback function to each value in the deque.

Parameters

callback

mixed callback ( mixed $value )

A callable to apply to each value in the deque.

The callable should return what the new value will be in the new deque.

Return Values

The result of applying a callback to each value in the deque.

Note:

The values of the current instance won't be affected.

Examples

Example #1 Ds\Deque::map() example

<?php
$deque 
= new \Ds\Deque([123]);

print_r($deque->map(function($value) { return $value 2; }));
print_r($deque);
?>

The above example will output something similar to:

Ds\Deque Object
(
    [0] => 2
    [1] => 4
    [2] => 6
)
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
)
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