Gain insights into React updates since V16, including new lifecycle methods, context API, and hooks. Discover how to utilize these features for writing better modern React applications.

What’s new with React? New lifecycle methods, context API, hooks, and lots more. While the fundamental principles of React have stayed the same, the way we write React apps has changed with each new release.  

If you learned React a while back, it’s possible that you haven’t been up to date with every new feature/release. It’s also possible to get lost in all the new features. Where exactly do you start? How important are they for your day to day use?

This course is your one-stop reference to most important React updates since V16 was released. We’ll walk through all the major features of modern React so you can stay in sync with the most recent changes while learning to write better software.

Reintroducing React: V16 and Beyond

We can add some lazy loading to the bank application we saw in the last chapter. 

Consider the `Root` component of the application: 

const Root = () => (
  <UserProvider>
    <UserConsumer>
      {({ user, handleLogin }) =>
        user ? <App /> : <Login handleLogin={handleLogin} />
      }
    </UserConsumer>
  </UserProvider>
)


# Lazy Loading the App Component 

When a user isn’t logged in, we display the login page. The `App` component is displayed only when the user is logged in.


We could lazy load the `App` component, right? 

This is very easy. You use the dynamic import syntax with `React.lazy` and wrap the `App` component in a `Suspense` component. 

Here’s how: 

In this lesson, we'll add lazy loading to our bank app to increase its performance.


Introduction

Lifecycle

Context API

ContextType

React.memo

The Profiler

Lazy Loading

Hooks

Learn to Localize a React Web App Using React Intl

Conclusion

Adding Lazy Loading to the Bank App