Ds\Vector::map
(PECL ds >= 1.0.0)
Ds\Vector::map — Returns the result of applying a callback to each value
説明
Returns the result of applying a callback
function to
each value in the vector.
パラメータ
callback
-
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
例1 Ds\Vector::map() example
<?php
$vector = new \Ds\Vector([1, 2, 3]);
print_r($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 )
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