Ds\Deque::unshift

(PECL ds >= 1.0.0)

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

Descrizione

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.

Elenco dei parametri

values

The values to add to the front of the deque.

Nota:
Multiple values will be added in the same order that they are passed.

Valori restituiti

Nessun valore viene restituito.

Esempi

Example #1 Ds\Deque::unshift() example

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

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

print_r($deque);
?>

Il precedente esempio visualizzerà qualcosa simile a:

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

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User Contributed Notes 1 note

down

hugo at fc dot up dot pt ¶

3 years 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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