Advanced React Hooks
In order for us to maximize our efforts during the workshop, please do the following:
- Setup the project (follow the setup instructions below) (~5 minutes)
- Install and setup Zoom on the computer you will be using (~5 minutes)
- Watch Use Zoom for KCD Workshops (~8 minutes).
- Watch Setup and Logistics for KCD Workshops (~24 minutes). Please do NOT skip this step.
- Watch The Beginner's Guide to React (available free on Egghead.io), or have the equivalent experience (77 minutes)
- Watch my talk Why React Hooks (35 minutes)
- Go through my
Learn React Hooks Workshop, or
have the equivalent basic experience of using hooks. You should be
The more prepared you are for the workshop, the better it will go for you.
You will be learning and using the following hooks:
useReducer: simple Counter
useReducer: HTTP requests
useContext: simple Counter (covers
useContext: Caching response data in context (covers
useLayoutEffect: auto-growing textarea
useImperativeHandle: scroll to top/bottom
All of these must be available in your
PATH. To verify things are set up
properly, you can run this:
git --version node --version yarn --version # or npm --version
You should be able to work through the entire workshop in the browser. This is actually the recommended approach as it requires absolutely no setup whatsoever. Go to this codesandbox and you should be good to go.
If you'd rather be able to work through the workshop on your own computer, then follow the following instructions.
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:
# If you were given instructions for a specific branch to use, then use this command # git clone --single-branch --branch <branchname> https://github.com/kentcdodds/advanced-react-hooks.git # otherwise, this is fine: git clone https://github.com/kentcdodds/advanced-react-hooks.git # then do this: cd advanced-react-hooks npm run setup --silent
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. You may also want to look at Troubleshooting. 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).
Running the app
To get the app up and running (and really see if it worked), run:
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
This will start Jest in watch mode. Read the output and play around with it.
Working through it
This a very exercise-heavy workshop. You'll find the exercises in the
src/exercises directory. I recommend running the tests and the application.
When you start an exercise, pull up the exercises page in the app and the test
Your goal will be to go into each test, swap the final version for the exercise version in the import, and make the tests pass
🐨 💰 💯 🦉 📜 💣 🚨
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 Bear
🐨will tell you when there's something specific you should do
- 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)
- Alfred the Alert
🚨may occasionally show up in the test failures with potential explanations for why the tests are failing.
"npm run setup" command not working
Here's what the setup script does. If it fails, try doing each of these things individually yourself:
# install dependencies npm install # verify your environment will work with the project npm run validate
If any of those scripts fail, please try to work out what went wrong by the error message you get. If you still can't work it out, feel free to open an issue with all the output from that script. I will try to help if I can.
"Error: ENOSPC: System limit for number of file watchers reached" when running tests
Try increasing your system's file watchers limit:
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
Read more about what’s happening at https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers#the-technical-details
Thanks goes to these wonderful people (emoji key):
Kent C. Dodds
This project follows the all-contributors specification. Contributions of any kind welcome!