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Add deque for JavaScript and typescript (#267)

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* add deque in javascript and typescript

* update the variables name

* update the time complexity

* Directly operating on the Array

* fix the ts file

* update the method complexity

* update the js file

---------

Co-authored-by: steak-zhuo <zhuoqinyue@gmail.com>
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zhuoqinyue 2023-02-04 14:55:11 +08:00 committed by GitHub
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39
codes/javascript/chapter_stack_and_queue/deque.js Normal file
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/**
* File: deque.js
* Created Time: 2023-01-17
* Author: Zhuo Qinyue (1403450829@qq.com)
*/
/* 初始化双向队列 */
/* JavaScript 没有内置的双端队列，可以把 Array 当作双端队列来使用 */
const deque = [];
/* 元素入队 */
deque.push(2);
deque.push(5);
deque.push(4);
/* unshift() 方法的时间复杂度为 O(n) */
deque.unshift(3);
deque.unshift(1);
console.log("双向队列 deque = ", deque);
/* 访问元素 */
const peekFirst = deque[0];
console.log("队首元素 peekFirst = " + peekFirst);
const peekLast = deque[deque.length - 1];
console.log("队尾元素 peekLast = " + peekLast);
/* 元素出队 */
/* shift() 方法的时间复杂度为 O(n) */
const popFront = deque.shift();
console.log("队首出队元素 popFront = " + popFront + "，队首出队后 deque = " + deque);
const popBack = deque.pop();
console.log("队尾出队元素 popBack = " + popBack + "，队尾出队后 deque = " + deque);
/* 获取双向队列的长度 */
const size = deque.length;
console.log("双向队列长度 size = " + size);
/* 判断双向队列是否为空 */
const isEmpty = size === 0;
console.log("双向队列是否为空 = " + isEmpty);

41
codes/typescript/chapter_stack_and_queue/deque.ts Normal file
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/**
* File: deque.ts
* Created Time: 2023-01-17
* Author: Zhuo Qinyue (1403450829@qq.com)
*/
/* 初始化双向队列 */
/* JavaScript 没有内置的双端队列，可以把 Array 当作双端队列来使用 */
const deque: number[] = [];
/* 元素入队 */
deque.push(2);
deque.push(5);
deque.push(4);
/* unshift() 方法的时间复杂度为 O(n) */
deque.unshift(3);
deque.unshift(1);
console.log("双向队列 deque = ", deque);
/* 访问元素 */
const peekFirst: number = deque[0];
console.log("队首元素 peekFirst = " + peekFirst);
const peekLast: number = deque[deque.length - 1];
console.log("队尾元素 peekLast = " + peekLast);
/* 元素出队 */
/* shift() 方法的时间复杂度为 O(n) */
const popFront: number = deque.shift() as number;
console.log("队首出队元素 popFront = " + popFront + "，队首出队后 deque = " + deque);
const popBack: number = deque.pop() as number;
console.log("队尾出队元素 popBack = " + popBack + "，队尾出队后 deque = " + deque);
/* 获取双向队列的长度 */
const size: number = deque.length;
console.log("双向队列长度 size = " + size);
/* 判断双向队列是否为空 */
const isEmpty: boolean = size === 0;
console.log("双向队列是否为空 = " + isEmpty);
export {};