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(PECL ds >= 1.0.0)
Ds\Deque::map — Returns the result of applying a callback to each value
Returns the result of applying a callback
function to
each value in the deque.
callback
A callable to apply to each value in the deque.
The callable should return what the new value will be in the new deque.
The result of applying a callback
to each value in
the deque.
注意:
The values of the current instance won't be affected.
示例 #1 Ds\Deque::map() example
<?php
$deque = new \Ds\Deque([1, 2, 3]);
print_r($deque->map(function($value) { return $value * 2; }));
print_r($deque);
?>
以上示例的输出类似于:
Ds\Deque Object ( [0] => 2 [1] => 4 [2] => 6 ) Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 )