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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

    Description

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

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

    Liste de paramètres

    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.

    Valeurs de retour

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

    Note:

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

    Exemples

    Exemple #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);
    ?>

    Résultat de l'exemple ci-dessus est similaire à :

    (
    [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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