Update the coding style for JavaScript (#329)

* Fix bug before commit 5eae708

* Update queue.md

* Update the coding style for JavaScript

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/javascript/chapter_array_and_linkedlist/linked_list.js

@@ -4,8 +4,8 @@
  * Author: IsChristina (christinaxia77@foxmail.com), Justin (xiefahit@gmail.com)
  */
 
-const PrintUtil = require("../include/PrintUtil");
-const ListNode = require("../include/ListNode");
+const { printLinkedList } = require("../include/PrintUtil");
+const { ListNode } = require("../include/ListNode");
 
 /* 在链表的结点 n0 之后插入结点 P */
 function insert(n0, P) {
@@ -62,17 +62,17 @@ n1.next = n2;
 n2.next = n3;
 n3.next = n4;
 console.log("初始化的链表为");
-PrintUtil.printLinkedList(n0);
+printLinkedList(n0);
 
 /* 插入结点 */
 insert(n0, new ListNode(0));
 console.log("插入结点后的链表为");
-PrintUtil.printLinkedList(n0);
+printLinkedList(n0);
 
 /* 删除结点 */
 remove(n0);
 console.log("删除结点后的链表为");
-PrintUtil.printLinkedList(n0);
+printLinkedList(n0);
 
 /* 访问结点 */
 const node = access(n0, 3);

codes/javascript/chapter_computational_complexity/worst_best_time_complexity.js

@@ -13,8 +13,8 @@ function randomNumbers(n) {
     }
     // 随机打乱数组元素
     for (let i = 0; i < n; i++) {
-        let r = Math.floor(Math.random() * (i + 1));
-        let temp = nums[i];
+        const r = Math.floor(Math.random() * (i + 1));
+        const temp = nums[i];
         nums[i] = nums[r];
         nums[r] = temp;
     }
@@ -34,14 +34,12 @@ function findOne(nums) {
 }
 
 /* Driver Code */
-function main() {
-    for (let i = 0; i < 10; i++) {
-        let n = 100;
-        let nums = randomNumbers(n);
-        let index = findOne(nums);
-        console.log(
-            "\n数组 [ 1, 2, ..., n ] 被打乱后 = [" + nums.join(", ") + "]"
-        );
-        console.log("数字 1 的索引为 " + index);
-    }
+for (let i = 0; i < 10; i++) {
+    const n = 100;
+    const nums = randomNumbers(n);
+    const index = findOne(nums);
+    console.log(
+        "\n数组 [ 1, 2, ..., n ] 被打乱后 = [" + nums.join(", ") + "]"
+    );
+    console.log("数字 1 的索引为 " + index);
 }

codes/javascript/chapter_searching/hashing_search.js

@@ -4,9 +4,7 @@
  * Author: Zhuo Qinyue (1403450829@qq.com)
  */
 
-const PrintUtil = require("../include/PrintUtil");
-const ListNode = require("../include/ListNode");
-
+const { ListNode, arrToLinkedList } = require("../include/ListNode");
 
 /* 哈希查找（数组） */
 function hashingSearchArray(map, target) {
@@ -22,30 +20,26 @@ function hashingSearchLinkedList(map, target) {
     return map.has(target) ? map.get(target) : null;
 }
 
-function main() {
-    const target = 3;
+/* Driver Code */
+const target = 3;
 
-    /* 哈希查找（数组） */
-    const nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
-    // 初始化哈希表
-    const map = new Map();
-    for (let i = 0; i < nums.length; i++) {
-      map.set(nums[i], i);  // key: 元素，value: 索引
-    }
-    const index = hashingSearchArray(map, target);
-    console.log("目标元素 3 的索引 = " + index);
-
-    /* 哈希查找（链表） */
-    let head = new ListNode().arrToLinkedList(nums)
-    // 初始化哈希表
-    const map1 = new Map();
-    while (head != null) {
-      map1.set(head.val, head);  // key: 结点值，value: 结点
-      head = head.next;
-    }
-    const node = hashingSearchLinkedList(map1, target);
-    console.log("目标结点值 3 的对应结点对象为" );
-    PrintUtil.printLinkedList(node);
+/* 哈希查找（数组） */
+const nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
+// 初始化哈希表
+const map = new Map();
+for (let i = 0; i < nums.length; i++) {
+    map.set(nums[i], i);  // key: 元素，value: 索引
 }
+const index = hashingSearch(map, target);
+console.log("目标元素 3 的索引 = " + index);
 
-main();
+/* 哈希查找（链表） */
+let head = arrToLinkedList(nums)
+// 初始化哈希表
+const map1 = new Map();
+while (head != null) {
+    map1.set(head.val, head);  // key: 结点值，value: 结点
+    head = head.next;
+}
+const node = hashingSearch1(map1, target);
+console.log("目标结点值 3 的对应结点对象为", node);

codes/javascript/chapter_searching/linear_search.js

@@ -4,7 +4,7 @@
  * Author: JoseHung (szhong@link.cuhk.edu.hk)
  */
 
-const ListNode = require("../include/ListNode");
+const { ListNode, arrToLinkedList } = require("../include/ListNode");
 
 /* 线性查找（数组） */
 function linearSearchArray(nums, target) {
@@ -34,15 +34,14 @@ function linearSearchLinkedList(head, target) {
 }
 
 /* Driver Code */
-var target = 3;
+const target = 3;
 
 /* 在数组中执行线性查找 */
-var nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
-var index = linearSearchArray(nums, target);
+const nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
+const index = linearSearchArray(nums, target);
 console.log("目标元素 3 的索引 = " + index);
 
 /* 在链表中执行线性查找 */
-var linkedList = new ListNode();
-var head = linkedList.arrToLinkedList(nums);
-var node = linearSearchLinkedList(head, target);
-console.log("目标结点值 3 的对应结点对象为 " + node);
+const head = arrToLinkedList(nums);
+const node = linearSearchLinkedList(head, target);
+console.log("目标结点值 3 的对应结点对象为 ", node);

codes/javascript/chapter_stack_and_queue/linkedlist_queue.js

@@ -4,7 +4,7 @@
  * Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
  */
 
-const ListNode = require("../include/ListNode");
+const { ListNode } = require("../include/ListNode");
 
 /* 基于链表实现的队列 */
 class LinkedListQueue {

codes/javascript/chapter_stack_and_queue/linkedlist_stack.js

@@ -4,7 +4,7 @@
  * Author: S-N-O-R-L-A-X (snorlax.xu@outlook.com)
  */
 
-const ListNode = require("../include/ListNode");
+const { ListNode } = require("../include/ListNode");
 
 /* 基于链表实现的栈 */
 class LinkedListStack {

codes/javascript/include/ListNode.js

@@ -11,37 +11,41 @@ class ListNode {
     val;
     next;
     constructor(val, next) {
-        this.val = (val === undefined ? 0 : val); 
-        this.next = (next === undefined ? null : next); 
-    }
-    
-    /**
-     * Generate a linked list with an array
-     * @param arr
-     * @return
-     */
-    arrToLinkedList(arr) {
-        const dum = new ListNode(0);
-        let head = dum;
-        for (const val of arr) {
-            head.next = new ListNode(val);
-            head = head.next;
-        }
-        return dum.next;
-    }
-
-    /**
-     * Get a list node with specific value from a linked list
-     * @param head
-     * @param val
-     * @return
-     */
-    getListNode(head, val) {
-        while (head !== null && head.val !== val) {
-            head = head.next;
-        }
-        return head;
+        this.val = (val === undefined ? 0 : val);
+        this.next = (next === undefined ? null : next);
     }
 }
 
-module.exports = ListNode
+/**
+ * Generate a linked list with an array
+ * @param arr
+ * @return
+ */
+function arrToLinkedList(arr) {
+    const dum = new ListNode(0);
+    let head = dum;
+    for (const val of arr) {
+        head.next = new ListNode(val);
+        head = head.next;
+    }
+    return dum.next;
+}
+
+/**
+ * Get a list node with specific value from a linked list
+ * @param head
+ * @param val
+ * @return
+ */
+function getListNode(head, val) {
+    while (head !== null && head.val !== val) {
+        head = head.next;
+    }
+    return head;
+}
+
+module.exports = {
+    ListNode,
+    arrToLinkedList,
+    getListNode
+};

docs/chapter_computational_complexity/time_complexity.md

@@ -2647,8 +2647,8 @@ $$
         }
         // 随机打乱数组元素
         for (let i = 0; i < n; i++) {
-            let r = Math.floor(Math.random() * (i + 1));
-            let temp = nums[i];
+            const r = Math.floor(Math.random() * (i + 1));
+            const temp = nums[i];
             nums[i] = nums[r];
             nums[r] = temp;
         }