2022-12-05 22:03:36 +08:00
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/**
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* File: queue.js
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2022-12-05 22:07:41 +08:00
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* Created Time: 2022-12-05
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2022-12-05 22:03:36 +08:00
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* Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
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*/
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2022-12-20 21:02:09 +08:00
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/* Driver Code */
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2022-12-05 22:03:36 +08:00
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/* 初始化队列 */
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2022-12-20 21:33:14 +08:00
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// JavaScript 没有内置的队列，可以把 Array 当作队列来使用
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2022-12-05 22:03:36 +08:00
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const queue = [];
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/* 元素入队 */
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queue.push(1);
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queue.push(3);
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queue.push(2);
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queue.push(5);
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queue.push(4);
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/* 访问队首元素 */
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const peek = queue[0];
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/* 元素出队 */
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2022-12-20 21:33:14 +08:00
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// 底层是数组，因此 shift() 方法的时间复杂度为 O(n)
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2022-12-05 22:03:36 +08:00
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const poll = queue.shift();
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/* 获取队列的长度 */
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const size = queue.length;
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/* 判断队列是否为空 */
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const empty = queue.length === 0;
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