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In this course, you will learn how to use React Hooks, which will help you achieve better code composition, code reuse, and unit testing ability as opposed to using class components.

You’ll start by reviewing what React Hooks are all about and why we need them. This will set the stage for the rest of the course. After that you will dive into the Hooks API, how to manage application state globally, as well as how to create custom hooks.

In the second half, you’ll get into unit testing and how to work with the popular useDependency Pattern. By the end of this course, you’ll have the confidence to write enterprise-level React Hooks code.

A Deep Dive into React Hooks

### Running effects after change in props or state

Dependencies array can be used to manage when side effects are run.

Below is a slightly advanced example of `useEffect` hook. Assume the application allows users to set a nickname using an input field. After the nickname is set, it fetches a personalized greeting message from an external API. The following exercise demonstrates this application.

Run the application. You should see something like this:

# Running effects after change in props or state

Dependencies array can be used to manage when side effects are run.

Below is a slightly advanced example of `useEffect` hook. Assume the application allows users to set a nickname using an input field. After the nickname is set, it fetches a personalized greeting message from an external API. The following exercise demonstrates this application.

Run the application. You should see something like this:

In this lesson, you will discover how the “useEffect” hook runs an inline function when a prop or state mentioned in the dependencies array changes.

Introduction

Getting Started with React Hooks

React Hooks API

Advanced: Deep Dive into useEffect Hook

Managing Global State with Hooks

Create Your Own Hooks

Unit Testing for React Hooks

Advanced: useDependency Pattern with Hooks

Conclusion

Run useEffect Function with Change in State or Props

Running effects after change in props or state