Ds\Deque::rotate

(PECL ds >= 1.0.0)

Ds\Deque::rotate — Rotates the deque by a given number of rotations

説明

public function Ds\Deque::rotate(int $rotations): void

Rotates the deque by a given number of rotations, which is equivalent to successively calling $deque->push($deque->shift()) if the number of rotations is positive, or $deque->unshift($deque->pop()) if negative.

パラメータ

rotations: The number of times the deque should be rotated.

戻り値

値を返しません。. The deque of the current instance will be rotated.

例

例1 Ds\Deque::rotate() example

<?php
$deque = new \Ds\Deque(["a", "b", "c", "d"]);

$deque->rotate(1);  // "a" is shifted, then pushed.
print_r($deque);

$deque->rotate(2);  // "b" and "c" are both shifted, then pushed.
print_r($deque);
?>

上の例の出力は、たとえば以下のようになります。

(
    [0] => b
    [1] => c
    [2] => d
    [3] => a
)
Ds\Deque Object
(
    [0] => d
    [1] => a
    [2] => b
    [3] => c
)

関連キーワード:

deque Deque rotations number rotate Rotates given rotated shifted pushed print reversed equivalent successively calling push shift positive unshift negative times current instance example