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    Ds\Deque::map

    (PECL ds >= 1.0.0)

    Ds\Deque::map — Returns the result of applying a callback to each value

    说明

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

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

    参数

    callback

    callback(mixed $value): mixed

    A callable to apply to each value in the deque.

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

    返回值

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

    注意:

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

    示例

    示例 #1 Ds\Deque::map() example

    <?php
    $deque     = new \Ds\Deque([1, 2, 3]);

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

    以上示例的输出类似于：

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