Ds\Deque::apply

    (PECL ds >= 1.0.0)

    Ds\Deque::apply — Updates all values by applying a callback function to each value

    Description

    publicDs\Deque::apply(callable$callback): void

    Updates all values by applying a callback function to each value in the deque.

    Parameters

    callback

    callback(mixed$value): mixed

    A callable to apply to each value in the deque.

    The callback should return what the value should be replaced by.

    Return Values

    No value is returned.

    Examples

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

    <?php
    $deque     = new \Ds\Deque([1, 2, 3]);
    $deque->apply(function($value) { return $value * 2; });

    print_r($deque);
    ?>

    The above example will output something similar to:

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