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    Ds\Map::map

    (PECL ds >= 1.0.0)

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

    説明

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

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

    パラメータ

    callback

    callback(mixed $key, mixed $value): mixed

    A callable to apply to each value in the map.

    The callable should return what the key will be mapped to in the resulting map.

    戻り値

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

    注意:

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

    例

    例1 Ds\Map::map() example

    <?php
    $map     = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);

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

    上の例の出力は、 たとえば以下のようになります。

    (
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => 2
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => 4
        )

    [2] => Ds\Pair Object
        (
            [key] => c
            [value] => 6
        )

)
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => 1
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => 2
        )

    [2] => Ds\Pair Object
        (
            [key] => c
            [value] => 3
        )

)

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