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36 lines
870 B
JavaScript
36 lines
870 B
JavaScript
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/**
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* File: queue.js
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* Created Time: 2022-12-05
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* Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
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*/
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/* Driver Code */
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/* 初始化佇列 */
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// JavaScript 沒有內建的佇列，可以把 Array 當作佇列來使用
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const queue = [];
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/* 元素入列 */
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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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console.log('佇列 queue =', queue);
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/* 訪問佇列首元素 */
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const peek = queue[0];
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console.log('佇列首元素 peek =', peek);
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/* 元素出列 */
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// 底層是陣列，因此 shift() 方法的時間複雜度為 O(n)
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const pop = queue.shift();
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console.log('出列元素 pop =', pop, '，出列後 queue = ', queue);
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/* 獲取佇列的長度 */
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const size = queue.length;
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console.log('佇列長度 size =', size);
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/* 判斷佇列是否為空 */
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const isEmpty = queue.length === 0;
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console.log('佇列是否為空 = ', isEmpty);
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