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39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
/**
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* File: deque.js
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* Created Time: 2023-01-17
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* Author: Zhuo Qinyue (1403450829@qq.com)
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*/
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/* 初始化双向队列 */
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// JavaScript 没有内置的双端队列，只能把 Array 当作双端队列来使用
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const deque = [];
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/* 元素入队 */
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deque.push(2);
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deque.push(5);
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deque.push(4);
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// 请注意，由于是数组，unshift() 方法的时间复杂度为 O(n)
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deque.unshift(3);
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deque.unshift(1);
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console.log("双向队列 deque = ", deque);
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/* 访问元素 */
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const peekFirst = deque[0];
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console.log("队首元素 peekFirst = " + peekFirst);
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const peekLast = deque[deque.length - 1];
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console.log("队尾元素 peekLast = " + peekLast);
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/* 元素出队 */
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// 请注意，由于是数组，shift() 方法的时间复杂度为 O(n)
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const popFront = deque.shift();
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console.log("队首出队元素 popFront = " + popFront + "，队首出队后 deque = " + deque);
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const popBack = deque.pop();
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console.log("队尾出队元素 popBack = " + popBack + "，队尾出队后 deque = " + deque);
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/* 获取双向队列的长度 */
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const size = deque.length;
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console.log("双向队列长度 size = " + size);
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/* 判断双向队列是否为空 */
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const isEmpty = size === 0;
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console.log("双向队列是否为空 = " + isEmpty);
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