# Add item, update state (ok)

C:\Users\Administrator\Desktop\test\src\index.ts

```typescript
import { v4 as uuidV4 } from "uuid";
type Task = {
  id: string,
  title: string,
  completed: boolean,
  createdAt: Date
}
const tasks: Task[] = getListItem();
const list = document.querySelector<HTMLUListElement>("#list");
const form = document.querySelector<HTMLFormElement>("#new-task-form");
const input = document.querySelector<HTMLInputElement>("#new-task-title");
tasks.forEach(addListItem);
form?.addEventListener("submit", (e) => {
  e.preventDefault();
  if (!input?.value) return;
  const newTask: Task = {
    id: uuidV4(),
    title: input.value,
    completed: false,
    createdAt: new Date()
  }
  tasks.push(newTask);
  addListItem(newTask);
  input.value = "";
});
function addListItem(task: Task) {
  const item = document.createElement("li")
  const label = document.createElement('label')
  const checkbox = document.createElement('input')
  checkbox.addEventListener("change", () => {
    task.completed = checkbox.checked;
    saveTasks();
  })
  checkbox.type = "checkbox"
  checkbox.checked = task.completed
  // compine all the field/ elements into one using the array append method
  label.append(checkbox, task.title)
  item.append(label)
  list?.append(item);
  console.log(task.title);
}
function getListItem(): Task[] {
  const taskJson = localStorage.getItem('TASKS');
  if (!taskJson) return [];
  return JSON.parse(taskJson);
}
const saveTasks = () => {
  localStorage.setItem("TASKS", JSON.stringify(tasks))
}
```
