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JorgenHookham · Oct 15, 2019 · 9ed6b9d · 9ed6b9d
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diff --git a/.gitignore b/.gitignore
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+node_modules
diff --git a/README.md b/README.md
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+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.<br />
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.<br />
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.<br />
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.<br />
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.<br />
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
+
+You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
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+{
+  "name": "hooks-demo",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@types/jest": "24.0.19",
+    "@types/node": "12.7.12",
+    "@types/react": "16.9.6",
+    "@types/react-dom": "16.9.2",
+    "react": "^16.10.2",
+    "react-dom": "^16.10.2",
+    "react-scripts": "3.2.0",
+    "typescript": "3.6.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}
diff --git a/public/favicon.ico b/public/favicon.ico
diff --git a/public/index.html b/public/index.html
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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
diff --git a/public/logo192.png b/public/logo192.png
diff --git a/public/logo512.png b/public/logo512.png
diff --git a/public/manifest.json b/public/manifest.json
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+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
diff --git a/public/robots.txt b/public/robots.txt
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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
diff --git a/src/App.css b/src/App.css
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+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  margin: 5rem 0;
+  color: #09d3ac;
+}
diff --git a/src/App.test.tsx b/src/App.test.tsx
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+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+it('renders without crashing', () => {
+  const div = document.createElement('div');
+  ReactDOM.render(<App />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});
diff --git a/src/App.tsx b/src/App.tsx
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+import React from 'react';
+import logo from './logo.svg';
+import './App.css';
+import {
+  MyForm,
+  MyTimer,
+} from "./demo";
+
+const App: React.FC = () => {
+  return (
+    <div className="App">
+      <header className="App-header">
+        <img src={logo} className="App-logo" alt="logo" />
+        <p>
+          Edit <code>src/App.tsx</code> and save to reload.
+        </p>
+        <MyForm />
+        <MyTimer label="Demo Timer" />
+        <a
+          className="App-link"
+          href="https://reactjs.org"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Learn React
+        </a>
+      </header>
+    </div>
+  );
+}
+
+export default App;
diff --git a/src/demo.tsx b/src/demo.tsx
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+  ////////////////////
+ // REACT HOOKS 🎣 //
+////////////////////
+/*
+
+React hooks refer to two methods that were added to React somewhat recently.
+
+----->  `useState` 📌 and `useEffect` ⚡  <-----
+
+*/
+
+import React from "react";
+
+
+
+
+  ///////////////////////////////
+ // BEFORE THE BEGINNINING ⏳ //
+///////////////////////////////
+/*
+
+- What do people already know about react hooks?
+- What, if anything, are you most interested to learn about react hooks?
+
+*/
+
+
+
+
+  ///////////////////
+ // STATE HOOK 📌 //
+////////////////////
+/*
+
+Let's look at `useState` first, because it's very, very simple to understand.
+This method allows you to access React's state API. With it, you can add state
+to a functional component. Before, you generally had to build a class-based
+component if you wanted state. Let's see what it looks like:
+
+*/
+
+const MyForm: React.FC =  () => {
+  const [email, setEmail] = React.useState<string>("[email protected]");
+  const [password, setPassword] = React.useState<string>();
+  return <form onSubmit={(e) => {
+      e.preventDefault();
+      alert(`Email: ${email}\nPassword: ${password}`);
+  }}>
+    <input
+      type="email"
+      value={email}
+      onChange={e => setEmail(e.currentTarget.value)}
+    />
+    <input
+      type="password"
+      value={password}
+      onChange={e => setPassword(e.currentTarget.value)}
+    />
+    <input type="submit" value="Submit" />
+  </form>
+}
+/*
+Speaker notes:
+- return values
+- default value
+- static typing
+*/
+
+
+
+
+  ////////////////////
+ // EFFECT HOOK ⚡ //
+/////////////////////
+/*
+
+Now let's have a look at `useEffect`. This method provides access to React's
+component lifecycle; specifically `componentDidMount`, `componentDidUpdate` and
+`componentWillUnmount`. Let's have a look:
+
+*/
+interface TimerProps {
+  label: string;
+}
+
+const MyTimer: React.FC<TimerProps> = (props) => {
+  const [elapsed, setElapsed] = React.useState<number>(0);
+  const [timerHandle, setTimerHandle] = React.useState<number>();
+  React.useEffect(
+    () => {
+      // This block will be executed when the component mounts or updates.
+      setTimerHandle(
+        setTimeout(() => setElapsed(elapsed + 1), 1000) as unknown as number
+      );
+      return () => {
+        // This block will be executed then the component unmounts.
+        clearTimeout(timerHandle)
+      }
+    },
+    [ // The effect will only run when a value in this list has changed
+      elapsed,
+    ]
+  )
+  return <div>
+    <h1>{props.label}</h1>
+    Time elapsed is {elapsed} seconds.
+  </div>
+}
+/*
+Speaker notes:
+- funky type coersion
+- what will happen when component mounts
+- what will happen when component unmounts
+- what will happen when elapsed state changes
+- what will happen when label prop changes
+- exhaustive dependencies
+*/
+
+
+
+
+  //////////////////
+ // QUESTIONS ❓ //
+//////////////////
+/*
+
+🎊🎊🎊 Congratulations! You now know the basics of React hooks. 👍
+
+*/
+
+export {
+  MyForm,
+  MyTimer,
+}
+
+
+
+
+  ////////////////
+ // SO WHAT 🤷‍ //
+/////////////////
+/*
+
+- Hooks offer simpler syntax over previous versions of react
+- Custom hooks can be used to house common functionality in a composable form
+- Next time, we'll cover custom hooks
+
+*/
+
+
+
+
+  //////////////////////
+ // AFTER THE END ⌛ //
+//////////////////////
+/*
+
+- Try it out for 15 minutes (clone this repo or `npx create-react-app`)
+- Do you feel like you can write hooks now? Why not?
+- What would you like to learn next?
+- Things you did/didn't like about this session
+- Bonus: fix the compiler warning
+
+*/
+
+
+
+
+// Learn more at https://reactjs.org/docs/hooks-intro.html
+// Jorgen HOOKham
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		# https://www.robotstxt.org/robotstxt.html
		User-agent: *