translate arrToLinkedList method

codes/typescript/chapter_searching/hashing_search.ts

@@ -4,6 +4,10 @@
  * Author: zhuoqinyue (1403450829@qq.com)
  */
 
+import { printLinkedList } from "../module/PrintUtil";
+import ListNode from "../module/ListNode";
+
+
 /* 哈希查找（数组） */
 function hashingSearch(map: Map<number, number>, target: number) {
   // 哈希表的 key: 目标元素，value: 索引
@@ -31,17 +35,17 @@ function main() {
   const index = hashingSearch(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 = hashingSearch1(map1, target);
-//   console.log("目标结点值 3 的对应结点对象为" );
-//   printLinkedList(node);
+  /* 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 = hashingSearch1(map1, target);
+  console.log("目标结点值 3 的对应结点对象为");
+  printLinkedList(node);
 }
 
 main();

codes/typescript/module/ListNode.ts

@@ -14,4 +14,19 @@ export default class ListNode {
         this.val = val === undefined ? 0 : val;
         this.next = next === undefined ? null : next;
     }
+
+    /**
+     * Generate a linked list with an array
+     * @param arr
+     * @return
+     */
+    arrToLinkedList(arr: number[]) {
+        const dum: ListNode = new ListNode(0);
+        let head = dum;
+        for (const val of arr) {
+            head.next = new ListNode(val);
+            head = head.next;
+        }
+        return dum.next;
+    }
 }