Discover how React Tracked optimizes render performance in web apps. Build a to-do app using two methods, and gain skills to create advanced applications efficiently.

React Tracked is a small library for global state with React Hooks and
React Context. It allows you to develop a small web app with global state
without a bigger library like Redux.

In this course, you will create a to-do app. But before diving into
creating an application, you’ll first learn how React Tracked can solve
common performance issues around render optimization. Once you learn how to
work with this library, you’ll then build a to-do app through two different
methods.

By the end of this course, you will be ready to build more advanced
applications without having to do unnecessary re-rendering. You’ll also
have a nice piece to showcase in your portfolio.

React Tracked: Creating Web Apps with Global State

# NewTodo

```javascript
import React, { useState } from 'react';

import { useDispatch } from './store';
import { useFlasher } from './utils';

const NewTodo = () => {
  const dispatch = useDispatch();
  const [text, setText] = useState('');
  const addTodo = () => {
    dispatch({ type: 'ADD_TODO', title: text });
    setText('');
  };
  return (
    <li ref={useFlasher()}>
      <input
        value={text}
        placeholder="Enter title..."
        onChange={e => setText(e.target.value)}
      />
      <button onClick={addTodo}>Add</button>
    </li>
  );
};

export default React.memo(NewTodo);
```

This component has a local state, `text`, for a text field. The local state is created with the React basic hook `useStat`. Only when a button is clicked, will it dispatch an action to the store.

# Next

In the next lesson, we finish up our app.

In this lesson, we learn how to develop a NewTodo component.

Creating a Counter App only with React Context

Introducing React Tracked to the Counter App

Developing ToDo App with React Tracked and useReducer

Developing ToDo App with React Tracked, useState and Immer

Going Further

NewTodo Component

NewTodo