mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 01:26:28 +08:00
35 lines
864 B
JavaScript
35 lines
864 B
JavaScript
/**
|
|
* File: queue.js
|
|
* Created Time: 2022-12-05
|
|
* Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
|
|
*/
|
|
|
|
/* Driver Code */
|
|
/* 初始化队列 */
|
|
// JavaScript 没有内置的队列,可以把 Array 当作队列来使用
|
|
const queue = [];
|
|
|
|
/* 元素入队 */
|
|
queue.push(1);
|
|
queue.push(3);
|
|
queue.push(2);
|
|
queue.push(5);
|
|
queue.push(4);
|
|
console.log('队列 queue =', queue);
|
|
|
|
/* 访问队首元素 */
|
|
const peek = queue[0];
|
|
console.log('队首元素 peek =', peek);
|
|
|
|
/* 元素出队 */
|
|
// 底层是数组,因此 shift() 方法的时间复杂度为 O(n)
|
|
const pop = queue.shift();
|
|
console.log('出队元素 pop =', pop, ',出队后 queue = ', queue);
|
|
|
|
/* 获取队列的长度 */
|
|
const size = queue.length;
|
|
console.log('队列长度 size =', size);
|
|
|
|
/* 判断队列是否为空 */
|
|
const isEmpty = queue.length === 0;
|
|
console.log('队列是否为空 = ', isEmpty);
|