kentcdodds/react-hooks

Prerequisites

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][win-path] or
[mac/linux][mac-path].

Setup

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/react-hooks.git  
cd 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][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:

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.

Transcript

Kent C. Dodds: 0:00 Welcome to React hooks. I cannot wait to show you the amazing tricks that we can do with React hooks to make our applications interactive. Applications aren't very fun if they're not interactive.

0:11 Let's take a look at the repo, and I'll get you all set up. Here's the repo React hooks. We scroll on down, and we clone the project. Once you have everything all up and running, then this is what you should see.

0:24 We've got useState, useEffect, lifting state, so some state management stuff that we're going to be learning about in here and then some pretty good practice with Tic-tac-toe.

0:34 I want to mention here on the Tic-tac-toe one. It is a little bit difficult, especially as you get into some of these extra credits. This last extra credit is quite challenging.

0:44 Prepare yourself mentally and emotionally for this one. I've had quite a few people tell me it's a little bit of a challenge, but you can do it and you can be successful and at least learn the interesting things about this, so look forward to that one. That one's going to be fun. We also have refs and useEffect, and then we have useEffect with HTTP requests.

1:06 I want to mention one other thing here. We've got the DevTools if you wanted to play around with the HTTP requests, especially for where we start using error boundaries and stuff, where you want to see what happens when things fail. This might be useful for you as you work through that.

1:23 Another interesting thing about this is we have a backend built into our projects, but you're not running a server. We're intercepting the requests using a tool called MSW and it's awesome.

1:36 This service does exist. If you don't want to use MSW, you want to hit the actual backend, then you can just comment out everything inside of this array. You'll be hitting the actual backend for this if you wanted to try that.

1:51 The reason that we have this is so you can work completely and entirely offline and we are not reliant on the service, because we're not paying anything for it. They're nice to have it available for us, but we're just going to make sure that we don't wind up at any problems. In any case, we are set to start making requests, which you're going to enjoy.

2:11 I'm looking forward to teaching you all about the basic React hooks, upon which you can build actual interactive real React applications. Look forward to this. Have a good time with it, and we'll see you on the other side of the workshop.