kentcdodds/react-fundamentals

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 or
mac/linux.

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-fundamentals.git  
cd react-fundamentals  
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. 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:

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.

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/rf-ws-feedback

Transcript

Kent C. Dodds: 0:00 What's up, folks? This is React Fundamentals, and I am excited to teach you the fundamentals of React.

0:05 Our first exercise, we actually don't even touch React. This is how fundamental we're going to get. I think it's really important that you get a good understanding of what your abstraction does.

0:16 We're going to start out with just nothing, then we'll just slowly incrementally add different tools as we go through the workshop so that you get a good understanding of, "OK, this is what this tool does, this is what that tool is responsible for," and so on and so forth.

0:28 Let's go ahead and take a look at this workshop. We have a React fundamentals rebuild right here. You can scroll down and find the setup. You copy-paste this in your terminal, get things all up and running, and then you'll have all of the code locally here. You're going to be working in source exercises, and you'll notice the first four of these is all in HTML files. That's what I'm talking about.

0:49 We're going to way back in the Web days, where it's all just html files. You can put little script tags in there. That way, you can identify, "OK, this is what Kent's cool little app is doing for me," but I can put this in an HTML file somewhere else.

1:04 It's going to run everything for me awesomely. It's cool that we have the capability of doing this. Eventually, we are going to get to regular JavaScript files because the ergonomics are a little bit better that way. Most of our stuff in the future and in this workshop is all regular JavaScript stuff.

1:21 Let's take a little tour. We have basic JavaScript rendered Hello World. With that, it's literally rendering Hello World to the page. We have a raw APIs like React's APIs Hello World. Finally, we'll get into using JSX.

1:39 A lot of what we're doing here is making sure you have a good understanding of what JSX is and how it translates into regular JavaScript APIs. We have creating custom components, styling, forms. Interestingly, rendering arrays is interesting with React.

1:56 If you've ever used React before and had to use the key prop or something, I'm going to teach you why that's necessary and why you probably shouldn't use the index when you do that. Plenty of awesome stuff to learn here. I'm excited for you to work through this material and learn the absolute fundamentals of React.

2:13 I've taught this stuff to tons of people. People who have four years of experience with React coming out of this telling me "Wow, I can't believe I learned stuff," and what was called fundamentals.

2:26 I must have skipped over those fundamentals. Well, often, we do when we're trying to ship stuff. No shame. It's the way it is. I'm excited for you to learn some of those fundamentals, and I'll see you on the other side of the workshop.