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    Ds\Vector::map

    (PECL ds >= 1.0.0)

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

    説明

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

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

    パラメータ

    callback

    callback(mixed $value): mixed

    A callable to apply to each value in the vector.

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

    戻り値

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

    注意:

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

    例

    例1 Ds\Vector::map() example

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

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

    上の例の出力は、 たとえば以下のようになります。

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