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    Ds\Sequence::map

    (PECL ds >= 1.0.0)

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

    Beschreibung

    abstract public Ds\Sequence::map(callable $callback): Ds\Sequence

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

    Parameter-Liste

    callback

    callback(mixed $value): mixed

    A callable to apply to each value in the sequence.

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

    Rückgabewerte

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

    Hinweis:

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

    Beispiele

    Beispiel #1 Ds\Sequence::map() example

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

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

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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