diff --git a/01-js/hard/todo-list.js b/01-js/hard/todo-list.js
index 7c9c1806..2f0b2039 100644
--- a/01-js/hard/todo-list.js
+++ b/01-js/hard/todo-list.js
@@ -1,18 +1,47 @@
-/*
-  Implement a class `Todo` having below methods
-    - add(todo): adds todo to list of todos
-    - remove(indexOfTodo): remove todo from list of todos
-    - update(index, updatedTodo): update todo at given index
-    - getAll: returns all todos
-    - get(indexOfTodo): returns todo at given index
-    - clear: deletes all todos
-
-  Once you've implemented the logic, test your code by running
-  - `npm run test-todo-list`
-*/
-
 class Todo {
-
+constructor(){
+this.arr=[];
+}
+ add(todo){
+this.arr.push(todo);
+}
+ remove(indexOfTodo){
+  if(indexOfTodo>=this.arr.length)
+  {
+    console.log('invalid index');
+    return null;
+  }
+  else{
+// this.arr.splice(indexOfTodo,1);
+for(var i=indexOfTodo; i<this.arr.length;i++){
+this.arr[i]=this.arr[i+1];
+}
+this.arr.length=this.arr.length-1;
+}
+}
+ update(index, updatedTodo){
+  if(index>=this.arr.length)
+  {
+    console.log('invalid index');
+    return null;
+  }
+  else
+  this.arr[index]= updatedTodo;
+}
+getAll(){
+return this.arr;
+}
+get(indexOfTodo){
+  if(indexOfTodo>=this.arr.length)
+  {
+    console.log('invalid index');
+    return null;
+  }
+return this.arr[indexOfTodo];
 }
+clear()
+{
+  this.arr=[];
+}}
 
 module.exports = Todo;