PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    Ds\Set::map

    (PECL ds >= 1.2.7)

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

    説明

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

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

    パラメータ

    callback

    The callback to apply to each value in the set must have the following signature:

    callback(mixed $value): mixed

    戻り値

    Returns a new Ds\Set instance where each value is the result of applying the callback to each value of the set.

    例

    例1 Ds\Set::map() example

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

    var_dump($set->map(function($value) { return $value * 2; }));
    var_dump($set);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    object(Ds\Set)#3 (3) {
  [0]=>
  int(2)
  [1]=>
  int(4)
  [2]=>
  int(6)
}
object(Ds\Set)#1 (3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes

    There are no user contributed notes for this page.
    To Top