Ds\Deque::unshift

(PECL ds >= 1.0.0)

Ds\Deque::unshift — Adds values to the front of the deque

说明

public Ds\Deque::unshift(mixed $values = ?): void

Adds values to the front of the deque, moving all the current values forward to make room for the new values.

参数

values: The values to add to the front of the deque.
注意:
Multiple values will be added in the same order that they are passed.

返回值

没有返回值。

范例

示例 #1 Ds\Deque::unshift() example


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

$deque->unshift("a");
$deque->unshift("b", "c");

print_r($deque);
?>

以上例程的输出类似于：

Ds\Deque Object
(
    [0] => b
    [1] => c
    [2] => a
    [3] => 1
    [4] => 2
    [5] => 3
)

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User Contributed Notes 1 note

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hugo at fc dot up dot pt ¶

1 year ago


Where the documentation says "moving all the current values forward", while it sounds like the complexity would be O(N), I checked the code at https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_deque.c#L366 and it is in fact O(1) for each element

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