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Ds\Map::apply

(PECL ds >= 1.0.0)

Ds\Map::applyUpdates all values by applying a callback function to each value

説明

public Ds\Map::apply(callable $callback): void

Updates all values by applying a callback function to each value in 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 callback should return what the value should be replaced by.

戻り値

値を返しません。

例1 Ds\Map::apply() example

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

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

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

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

)
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