mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-25 23:56:29 +08:00
30 lines
651 B
JavaScript
30 lines
651 B
JavaScript
|
/**
|
|||
|
|
* File: queue.js
|
|||
|
|
* Created Time: 2022-12-04
|
|||
|
|
* Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/* 初始化队列 */
|
|||
|
|
// Javascript 没有内置的队列，可以把 Array 当作队列来使用
|
|||
|
|
// 但是，要注意虽然Javascript有shift()函数可以去除队首元素，但是时间复杂度是O(n)的。
|
|||
|
|
const queue = [];
|
|||
|
|
|
|||
|
|
/* 元素入队 */
|
|||
|
|
queue.push(1);
|
|||
|
|
queue.push(3);
|
|||
|
|
queue.push(2);
|
|||
|
|
queue.push(5);
|
|||
|
|
queue.push(4);
|
|||
|
|
|
|||
|
|
/* 访问队首元素 */
|
|||
|
|
const peek = queue[0];
|
|||
|
|
|
|||
|
|
/* 元素出队 */
|
|||
|
|
const poll = queue.shift();
|
|||
|
|
|
|||
|
|
/* 获取队列的长度 */
|
|||
|
|
const size = queue.length;
|
|||
|
|
|
|||
|
|
/* 判断队列是否为空 */
|
|||
|
|
const empty = queue.length === 0;
|