translate arrToLinkedList method

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;
+    }
 }