Ds\Map::map

    (PECL ds >= 1.0.0)

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

    Description

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

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

    Parameters

    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.

    Return Values

    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.

    Examples

    Example #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);
    ?>

    The above example will output something similar to:

    ( [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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