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

Web performance is a big deal. Nobody has the time to sit through hours waiting for your webpage to load.


### Need of the Profiler

In order to measure performance and identify performance bottlenecks in your apps, it’s crucial to have some way to inspect how long it took your app’s components to render, and why they were rendered. 

This is exactly why the Profiler exists.


If you’ve been writing react for some time, you might remember the `react-addons-perf` module. 

Well, that has been **deprecated** in favor of the Profiler. 

 

Web performance is a big deal. Nobody has the time to sit through hours waiting for your webpage to load.


# Need of the Profiler

In order to measure performance and identify performance bottlenecks in your apps, it’s crucial to have some way to inspect how long it took your app’s components to render, and why they were rendered. 

This is exactly why the Profiler exists.


If you’ve been writing react for some time, you might remember the `react-addons-perf` module. 

Well, that has been **deprecated** in favor of the Profiler. 

 

In this lesson we will see how we can use Profiler to measure the performance of a React app.

Introduction

Lifecycle

Context API

ContextType

React.memo

The Profiler

Lazy Loading

Hooks

Conclusion

Measuring Performance in React Apps

Need of the Profiler