Add the remain JavaScript code (Chapter of Array and Linkedlist)
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justin
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84
codes/javascript/chapter_array_and_linkedlist/linked_list.js
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84
codes/javascript/chapter_array_and_linkedlist/linked_list.js
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/*
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* File: linked_list.js
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* Created Time: 2022-12-12
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* Author: Justin (xiefahit@gmail.com)
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*/
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const ListNode = require('../include/ListNode.js');
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const { printLinkedList } = require('../include/PrintUtil.js');
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/* 在链表的结点 n0 之后插入结点 P */
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function insert(n0, P) {
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const n1 = n0.next;
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n0.next = P;
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P.next = n1;
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}
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/* 删除链表的结点 n0 之后的首个结点 */
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function remove(n0) {
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if (!n0.next) {
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return;
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}
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// n0 -> P -> n1
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const P = n0.next;
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const n1 = P.next;
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n0.next = n1;
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}
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/* 访问链表中索引为 index 的结点 */
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function access(head, index) {
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for (let i = 0; i < index; i++) {
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if (!head) {
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return null;
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}
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head = head.next;
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}
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return head;
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}
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/* 在链表中查找值为 target 的首个结点 */
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function find(head, target) {
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let index = 0;
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while (head !== null) {
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if (head.val === target) {
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return index;
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}
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head = head.next;
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index += 1;
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}
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return -1;
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}
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/* Driver Code */
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/* 初始化链表 */
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// 初始化各个结点
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const n0 = new ListNode(1);
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const n1 = new ListNode(3);
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const n2 = new ListNode(2);
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const n3 = new ListNode(5);
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const n4 = new ListNode(4);
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// 构建引用指向
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n0.next = n1;
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n1.next = n2;
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n2.next = n3;
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n3.next = n4;
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console.log('初始化的链表为');
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printLinkedList(n0);
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/* 插入结点 */
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insert(n0, new ListNode(0));
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console.log('插入结点后的链表为');
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printLinkedList(n0);
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/* 删除结点 */
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remove(n0);
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console.log('删除结点后的链表为');
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printLinkedList(n0);
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/* 访问结点 */
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const node = access(n0, 3);
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console.log(`链表中索引 3 处的结点的值 = ${node?.val}`);
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/* 查找结点 */
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const index = find(n0, 2);
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console.log(`链表中值为 2 的结点的索引 = ${index}`);
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64
codes/javascript/chapter_array_and_linkedlist/list.js
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codes/javascript/chapter_array_and_linkedlist/list.js
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/*
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* File: list.js
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* Created Time: 2022-12-12
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* Author: Justin (xiefahit@gmail.com)
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*/
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/* 初始化列表 */
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const list = [1, 3, 2, 5, 4];
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console.log(`列表 list = ${list}`);
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/* 访问元素 */
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const num = list[1];
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console.log(`访问索引 1 处的元素，得到 num = ${num}`);
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/* 更新元素 */
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list[1] = 0;
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console.log(`将索引 1 处的元素更新为 0 ，得到 list = ${list}`);
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/* 清空列表 */
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list.length = 0;
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console.log(`清空列表后 list = ${list}`);
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/* 尾部添加元素 */
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list.push(1);
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list.push(3);
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list.push(2);
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list.push(5);
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list.push(4);
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console.log(`添加元素后 list = ${list}`);
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/* 中间插入元素 */
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list.splice(3, 0, 6);
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console.log(`在索引 3 处插入数字 6 ，得到 list = ${list}`);
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/* 删除元素 */
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list.splice(3, 1);
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console.log(`删除索引 3 处的元素，得到 list = ${list}`);
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/* 通过索引遍历列表 */
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let count = 0;
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for (let i = 0; i < list.length; i++) {
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count++;
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}
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/* 直接遍历列表元素 */
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count = 0;
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for (const n of list) {
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count++;
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}
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/* 直接遍历列表元素 */
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count = 0;
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for (const n of list) {
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count++;
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}
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/* 拼接两个列表 */
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const list1 = [6, 8, 7, 10, 9];
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list.push(...list1);
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console.log(`将列表 list1 拼接到 list 之后，得到 list = ${list}`);
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/* 排序列表 */
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list.sort((a, b) => a - b);
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console.log(`排序列表后 list = ${list}`);
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145
codes/javascript/chapter_array_and_linkedlist/my_list.js
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145
codes/javascript/chapter_array_and_linkedlist/my_list.js
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/*
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* File: my_list.js
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* Created Time: 2022-12-12
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* Author: Justin (xiefahit@gmail.com)
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*/
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/* 列表类简易实现 */
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class MyList {
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#nums = new Array(); // 数组（存储列表元素）
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#capacity = 10; // 列表容量
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#size = 0; // 列表长度（即当前元素数量）
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#extendRatio = 2; // 每次列表扩容的倍数
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/* 构造函数 */
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constructor() {
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this.#nums = new Array(this.#capacity);
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}
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/* 获取列表长度（即当前元素数量）*/
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size() {
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return this.#size;
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}
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/* 获取列表容量 */
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capacity() {
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return this.#capacity;
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}
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/* 访问元素 */
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get(index) {
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// 索引如果越界则抛出异常，下同
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if (index >= this.#size) {
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throw new Error('索引越界');
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}
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return this.#nums[index];
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}
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/* 更新元素 */
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set(index, num) {
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if (index >= this._size) throw new Error('索引越界');
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this.#nums[index] = num;
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}
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/* 尾部添加元素 */
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add(num) {
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// 如果长度等于容量，则需要扩容
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if (this.#size === this.#capacity) {
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this.extendCapacity();
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}
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// 将新元素添加到列表尾部
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this.#nums[this.#size] = num;
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this.#size++;
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}
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/* 中间插入元素 */
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insert(index, num) {
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if (index >= this.#size) {
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throw new Error('索引越界');
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}
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// 元素数量超出容量时，触发扩容机制
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if (this.#size === this.#capacity) {
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this.extendCapacity();
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}
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// 将索引 index 以及之后的元素都向后移动一位
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for (let j = this.#size - 1; j >= index; j--) {
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this.#nums[j + 1] = this.#nums[j];
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}
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// 更新元素数量
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this.#nums[index] = num;
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this.#size++;
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}
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/* 删除元素 */
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remove(index) {
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if (index >= this.#size) throw new Error('索引越界');
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let num = this.#nums[index];
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// 将索引 index 之后的元素都向前移动一位
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for (let j = index; j < this.#size - 1; j++) {
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this.#nums[j] = this.#nums[j + 1];
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}
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// 更新元素数量
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this.#size--;
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// 返回被删除元素
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return num;
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}
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/* 列表扩容 */
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extendCapacity() {
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// 新建一个长度为 size 的数组，并将原数组拷贝到新数组
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this.#nums = this.#nums.concat(
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new Array(this.capacity() * (this.#extendRatio - 1))
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);
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// 更新列表容量
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this.#capacity = this.#nums.length;
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}
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/* 将列表转换为数组 */
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toArray() {
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let size = this.size();
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// 仅转换有效长度范围内的列表元素
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let nums = new Array(size);
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for (let i = 0; i < size; i++) {
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nums[i] = this.get(i);
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}
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return nums;
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}
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}
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/* Driver Code */
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/* 初始化列表 */
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let list = new MyList();
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/* 尾部添加元素 */
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list.add(1);
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list.add(3);
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list.add(2);
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list.add(5);
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list.add(4);
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console.log(
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`列表 list = ${list.toArray()} ，容量 = ${list.capacity()} ，长度 = ${list.size()}`
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);
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/* 中间插入元素 */
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list.insert(3, 6);
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console.log(`在索引 3 处插入数字 6 ，得到 list = ${list.toArray()}`);
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/* 删除元素 */
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list.remove(3);
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console.log(`删除索引 3 处的元素，得到 list = ${list.toArray()}`);
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/* 访问元素 */
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let num = list.get(1);
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console.log(`访问索引 1 处的元素，得到 num = ${num}`);
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/* 更新元素 */
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list.set(1, 0);
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console.log(`将索引 1 处的元素更新为 0 ，得到 list = ${list.toArray()}`);
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/* 测试扩容机制 */
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for (let i = 0; i < 10; i++) {
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// 在 i = 5 时，列表长度将超出列表容量，此时触发扩容机制
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list.add(i);
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}
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console.log(
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`扩容后的列表 list = ${list.toArray()} ，容量 = ${list.capacity()} ，长度 = ${list.size()}`
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);
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17
codes/javascript/include/ListNode.js
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17
codes/javascript/include/ListNode.js
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/*
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* File: ListNode.js
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* Created Time: 2022-12-12
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* Author: Justin (xiefahit@gmail.com)
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*/
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/**
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* Definition for a singly-linked list node
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*/
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class ListNode {
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constructor(val, next) {
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this.val = val === undefined ? 0 : val;
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this.next = next === undefined ? null : next;
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}
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}
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module.exports = ListNode;
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