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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.

Learn React from Start to Finish

Build Status All Contributors GPL 3.0 License Code of Conduct Gitpod ready-to-code

Prerequisites

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

NOTE: The EpicReact.dev videos were recorded with React version ^16.13 and all material in this repo has been updated to React version ^18. Differences are minor and any relevant differences are noted in the instructions.

Additional Resources

Quick start

It's recommended you run everything in the same environment you work in every day, but if you don't want to set up the repository locally, you can get started in one click with Gitpod, CodeSandbox, or by following the video demo instructions for GitHub Codespaces.

Open in Gitpod

For a local development environment, follow the instructions below

System Requirements

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

If you are still unable to fix issues and you know how to use Docker 🐳 you can setup the project with the following command:

docker-compose up

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 🐨 πŸ’° πŸ’― πŸ“ πŸ¦‰ πŸ“œ πŸ’£ πŸ’ͺ 🏁 πŸ‘¨β€πŸ’Ό 🚨

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
  • Marty the Money Bag πŸ’° will give you specific tips (and sometimes code) along the way
  • Hannah the Hundred πŸ’― will give you extra challenges you can do if you finish the exercises early.
  • Nancy the Notepad πŸ“ will encourage you to take notes on what you're learning
  • Olivia the Owl πŸ¦‰ will give you useful tidbits/best practice notes and a link for elaboration and feedback.
  • Dominic the Document πŸ“œ will give you links to useful documentation
  • Berry the Bomb πŸ’£ will be hanging around anywhere you need to blow stuff up (delete code)
  • Matthew the Muscle πŸ’ͺ will indicate that you're working with an exercise
  • Chuck the Checkered Flag 🏁 will indicate that you're working with a final
  • Peter the Product Manager πŸ‘¨β€πŸ’Ό 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
Kent C. Dodds

πŸ’» πŸ“– πŸš‡ ⚠️
Frank Calise
Frank Calise

πŸ’»
Zara603
Zara603

πŸ’»
Michael Friedman
Michael Friedman

πŸ“–
Brandon Newton
Brandon Newton

πŸ“– πŸ’»
Jonathan Bruce
Jonathan Bruce

πŸ’»
Łukasz Gandecki
Łukasz Gandecki

πŸ“–
Justin Dorfman
Justin Dorfman

πŸ”
Oluwaseun Oyebade
Oluwaseun Oyebade

πŸ“–
Kevin Ostafinski
Kevin Ostafinski

πŸ“–
Markus Lasermann
Markus Lasermann

πŸ’» ⚠️
Zac Jones
Zac Jones

πŸ“–
Ricardo Busquet
Ricardo Busquet

πŸ’»
Kyle Matthew Reblora
Kyle Matthew Reblora

πŸ“–
Marco Moretti
Marco Moretti

πŸ’»
Selwyn Yeow
Selwyn Yeow

πŸ“–
Watchmaker
Watchmaker

πŸ’» πŸ“–
Carlos Fontes
Carlos Fontes

πŸ›
Pritam Sangani
Pritam Sangani

πŸ’»
William BEUIL
William BEUIL

πŸ“–
Emmanouil Zoumpoulakis
Emmanouil Zoumpoulakis

πŸ“–
Peter HozΓ‘k
Peter HozΓ‘k

πŸ’»
Joe Maffei
Joe Maffei

πŸ“–
Johnny Magrippis
Johnny Magrippis

πŸ’»
Ryan Huber
Ryan Huber

πŸ“– πŸ’»
Dominic Chapman
Dominic Chapman

πŸ“–
imalbert
imalbert

πŸ“–
Dennis Collon
Dennis Collon

πŸ“–
Jakub RΓ³ΕΌbicki
Jakub RΓ³ΕΌbicki

πŸ“–
Vasilii Kovalev
Vasilii Kovalev

πŸ›
Alexander Gonzalez
Alexander Gonzalez

πŸ’»
Dale Seo
Dale Seo

πŸ“– ⚠️
MichaΓ«l De Boey
MichaΓ«l De Boey

πŸ’»
Greg Sheppard
Greg Sheppard

πŸ“–
Bobby Warner
Bobby Warner

πŸ’»
Jakub Majorek
Jakub Majorek

πŸ’»
Giovanni Ravalico
Giovanni Ravalico

πŸ€”
Julio Soto
Julio Soto

πŸ’»
Juno Tesoro
Juno Tesoro

πŸ“–
AndrΓ©s Osante
AndrΓ©s Osante

πŸ’»
Ian VanSchooten
Ian VanSchooten

⚠️
Giancarlo Brusca
Giancarlo Brusca

πŸ“–
Tyler Sargent
Tyler Sargent

⚠️
Pavlos Vinieratos
Pavlos Vinieratos

πŸ“–
Hills
Hills

πŸ“–
Diego Torres
Diego Torres

πŸ’»
Joseph
Joseph

πŸ“–
Mario Sannum
Mario Sannum

πŸ’»
wdj82
wdj82

πŸ“–
Som Shekhar Mukherjee
Som Shekhar Mukherjee

πŸ’»
Tanmoy Das
Tanmoy Das

πŸ“–
MJ
MJ

πŸ“–
Sheryl Hohman
Sheryl Hohman

πŸ’»
Mohammad Shahbaz Alam
Mohammad Shahbaz Alam

πŸ“–
Anabella
Anabella

πŸ“–
Lucas Minter
Lucas Minter

πŸ“–
Simon Legg
Simon Legg

πŸ“–
Kenny Gray
Kenny Gray

πŸ“–
Alex Lee
Alex Lee

πŸ“–
plumcoding
plumcoding

⚠️
Nathan
Nathan

πŸ“–
Gavin Osborn
Gavin Osborn

πŸ“–
Pawan Kumar
Pawan Kumar

πŸ“–
Loris-Yanis
Loris-Yanis

πŸ’»
Ian MacIntosh
Ian MacIntosh

πŸ“–
Creeland A. Provinsal
Creeland A. Provinsal

πŸ“–

This project follows the all-contributors specification. Contributions of any kind welcome!

Workshop Feedback

Each exercise has an Elaboration and Feedback link. Please fill that out after the exercise and instruction.

At the end of the workshop, please go to this URL to give overall feedback. Thank you! https://kcd.im/arh-ws-feedback