added: linear search for Typescript

codes/typescript/chapter_searching/linear_search.ts

@@ -0,0 +1,47 @@
+/**
+ * File: linear_search.ts
+ * Created Time: 2023-01-07
+ * Author: Daniel (better.sunjian@gmail.com)
+ */
+
+import ListNode from '../module/ListNode.ts';
+
+/* 线性查找（数组） */
+function linearSearchArray(nums: number[], target: number): number {
+    // 遍历数组
+    for (let i = 0; i < nums.length; i++) {
+        // 找到目标元素，返回其索引
+        if (nums[i] === target) {
+            return i;
+        }
+    }
+    // 未找到目标元素，返回 -1
+    return -1;
+}
+
+/* 线性查找（链表）*/
+function linearSearchLinkedList(head: ListNode | null, target: number): ListNode | null {
+    // 遍历链表
+    while (head) {
+        // 找到目标结点，返回之
+        if (head.val === target) {
+            return head;
+        }
+        head = head.next;
+    }
+    // 未找到目标结点，返回 null
+    return null;
+}
+
+/* Driver Code */
+const target = 3;
+
+/* 在数组中执行线性查找 */
+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 */
+const head = ListNode.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/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 ListNode
+     */
+    public static arrToLinkedList(arr: number[]): ListNode | null {
+        const dum = new ListNode(0);
+        let head = dum;
+        for (const val of arr) {
+            head.next = new ListNode(val);
+            head = head.next;
+        }
+        return dum.next;
+    }
 }