Ds\Deque::unshift

    (PECL ds >= 1.0.0)

    Ds\Deque::unshift — Adds values to the front of the deque

    説明

    public Ds\Deque::unshift(mixed $values = ?): void

    Adds values to the front of the deque, moving all the current values forward to make room for the new values.

    パラメータ

    values

    The values to add to the front of the deque.

    注意:

    Multiple values will be added in the same order that they are passed.

    戻り値

    値を返しません。

    例

    例1 Ds\Deque::unshift() example

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

    $deque->unshift("a");
    $deque->unshift("b", "c");

    print_r($deque);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    Ds\Deque Object
(
    [0] => b
    [1] => c
    [2] => a
    [3] => 1
    [4] => 2
    [5] => 3
)

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    User Contributed Notes 1 note

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    1
    hugo at fc dot up dot pt
    4 years ago
    Where the documentation says "moving all the current values forward", while it sounds like the complexity would be O(N), I checked the code at https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_deque.c#L366 and it is in fact O(1) for each element
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