Ds\Vector::map

(PECL ds >= 1.0.0)

Ds\Vector::mapReturns the result of applying a callback to each value

説明

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

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

パラメータ

callback

callback(mixed $value): mixed

A callable to apply to each value in the vector.

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

戻り値

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

注意:

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

例1 Ds\Vector::map() example

<?php
$vector 
= new \Ds\Vector([123]);

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

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
)
Ds\Vector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
)
関連キーワード:  Ds, callback, each, result, applying, map, callable, Returns, new, Object