Gain insights into using React Hooks to enhance code composition and reuse. Delve into custom hooks, global state management, unit testing, and the useDependency Pattern for enterprise-level coding.

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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

Unit testing for React Hooks is an interesting topic. It requires a different approach compared to testing normal React components.

Assume you have a custom hook `useContent` to return some content value.

```
const useContent = () => {
  const [state] = useState('something');
  return state;
};
```

Write a simple test for the above hook using Jest `expect` like this.

```
test('useContent hook returns correct content', () => {
  expect(useContent()).toBe('something');
});

```

When this test is run, the following error occurs:

> Invalid hook call. Hooks can only be called inside of the body of a function component.

Oops. 

That's right. You tried to call a React Hook using `expect` which is not a React component. The next few lessons will explore different approaches to testing React Hooks. 

Why can’t you use the traditional way of unit testing with React Hooks?


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

Introduction