🔥 Advanced React Hooks 🚀 EpicReact.Dev

Learn the more advanced React hooks and different patterns to enable great developer APIs for custom hooks.

We’ll look at some of the more advanced hooks and ways they can be used to optimize your components and custom hooks. We’ll also look at several patterns you can follow to make custom hooks that provide great APIs for developers to be productive building applications.

Prerequisites

You should be experienced with useState, useEffect, and useRef.

Additional Resources

Videos Getting Closure on React Hooks by Shaen Wang (26 minutes)

System Requirements

git v2.13 or greater
NodeJS ^10.13 || 12 || 14
npm v6 or greater

All of these must be available in your PATH. To verify things are set up properly, you can run this:

git --version
node --version
npm --version

If you have trouble with any of these, learn more about the PATH environment variable and how to fix it here for windows or mac/linux.

Setup

If you want to commit and push your work as you go, you'll want to fork first and then clone your fork rather than this repo directly.

After you've made sure to have the correct things (and versions) installed, you should be able to just run a few commands to get set up:

git clone https://github.com/kentcdodds/advanced-react-hooks.git
cd advanced-react-hooks
node setup

This may take a few minutes. It will ask you for your email. This is optional and just automatically adds your email to the links in the project to make filling out some forms easier.

If you get any errors, please read through them and see if you can find out what the problem is. If you can't work it out on your own then please file an issue and provide all the output from the commands you ran (even if it's a lot).

If you can't get the setup script to work, then just make sure you have the right versions of the requirements listed above, and run the following commands:

npm install
npm run validate

It's recommended you run everything locally in the same environment you work in every day, but if you're having issues getting things set up, you can also set this up using GitHub Codespaces (video demo) or Codesandbox.

Running the app

To get the app up and running (and really see if it worked), run:

npm start

This should start up your browser. If you're familiar, this is a standard react-scripts application.

You can also open the deployment of the app on Netlify.

Running the tests

npm test

This will start Jest in watch mode. Read the output and play around with it. The tests are there to help you reach the final version, however sometimes you can accomplish the task and the tests still fail if you implement things differently than I do in my solution, so don't look to them as a complete authority.

Exercises

src/exercise/00.md: Background, Exercise Instructions, Extra Credit
src/exercise/00.js: Exercise with Emoji helpers
src/__tests__/00.js: Tests
src/final/00.js: Final version
src/final/00.extra-0.js: Final version of extra credit

The purpose of the exercise is not for you to work through all the material. It's intended to get your brain thinking about the right questions to ask me as I walk through the material.

Helpful Emoji 🐨 💪 🏁 💰 💯 🦉 📜 💣 👨‍💼 🚨

Each exercise has comments in it to help you get through the exercise. These fun emoji characters are here to help you.

Kody the Koala 🐨 will tell you when there's something specific you should do
Matthew the Muscle 💪 will indicate what you're working with an exercise
Chuck the Checkered Flag 🏁 will indicate that you're working with a final version
Marty the Money Bag 💰 will give you specific tips (and sometimes code) along the way
Hannah the Hundred 💯 will give you extra challenges you can do if you finish the exercises early.
Olivia the Owl 🦉 will give you useful tidbits/best practice notes and a link for elaboration and feedback.
Dominic the Document 📜 will give you links to useful documentation
Berry the Bomb 💣 will be hanging around anywhere you need to blow stuff up (delete code)
Peter the Product Manager 👨‍💼 helps us know what our users want
Alfred the Alert 🚨 will occasionally show up in the test failures with potential explanations for why the tests are failing.

Contributors

Thanks goes to these wonderful people (emoji key):

_{Kent C. Dodds} 💻 📖 🚇 ⚠️	_{Frank Calise} 💻	_Zara603 💻	_{Michael Friedman} 📖	_{Brandon Newton} 📖 💻	_{Jonathan Bruce} 💻	_{Łukasz Gandecki} 📖
_{Justin Dorfman} 🔍	_{Oluwaseun Oyebade} 📖	_{Kevin Ostafinski} 📖	_{Markus Lasermann} 💻	_{Zac Jones} 📖	_{Ricardo Busquet} 💻	_{Kyle Matthew Reblora} 📖
_{Marco Moretti} 💻	_{Selwyn Yeow} 📖	_Watchmaker 💻 📖	_{Carlos Fontes} 🐛	_{Pritam Sangani} 💻	_{William BEUIL} 📖	_{Emmanouil Zoumpoulakis} 📖
_{Peter Hozák} 💻	_{Joe Maffei} 📖	_{Johnny Magrippis} 💻	_{Ryan Huber} 📖 💻	_{Dominic Chapman} 📖	_imalbert 📖	_{Dennis Collon} 📖
_{Jakub Różbicki} 📖	_{Vasilii Kovalev} 🐛	_{Alexander Gonzalez} 💻	_{Dale Seo} 📖	_{Michaël De Boey} 💻	_{Greg Sheppard} 📖