Ds\Sequence::apply

(PECL ds >= 1.0.0)

Ds\Sequence::apply — Updates all values by applying a callback function to each value

説明

abstract public function Ds\Sequence::apply(callable $callback): void

Updates all values by applying a callback function to each value in the sequence.

パラメータ

callback

function callback(mixed $value): mixed

A callable to apply to each value in the sequence. The callback should return what the value should be replaced by.

戻り値

値を返しません。

例

例1 Ds\Sequence::apply() example

<?php
$sequence = new \Ds\Vector([1, 2, 3]);
$sequence->apply(function($value) { return $value * 2; });

print_r($sequence);
?>

上の例の出力は、 たとえば以下のようになります。

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