├── public
    ├── robots.txt
    ├── favicon.ico
    ├── logo192.png
    ├── logo512.png
    ├── manifest.json
    └── index.html
├── README.md
├── src
    ├── UseCallback
    │   ├── Child.js
    │   └── CallbackTutorial.js
    ├── UseContext
    │   ├── User.js
    │   ├── Login.js
    │   └── ContextTutorial.js
    ├── reportWebVitals.js
    ├── UseRef
    │   └── RefTutorial.js
    ├── UseState
    │   └── StateTutorial.js
    ├── UseImperativeHandle
    │   ├── Button.js
    │   └── ImperativeHandle.js
    ├── index.js
    ├── UseLayoutEffect
    │   └── LayoutEffectTutorial.js
    ├── App.js
    ├── App.css
    ├── UseEffect
    │   └── EffectTutorial.js
    ├── UseReducer
    │   └── ReducerTutorial.js
    └── UseMemo
    │   └── MemoTutorial.js
├── .gitignore
└── package.json


/public/robots.txt:
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1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | Disallow:
4 | 


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/public/favicon.ico:
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https://raw.githubusercontent.com/machadop1407/react-hooks-course/HEAD/public/favicon.ico


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/public/logo192.png:
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https://raw.githubusercontent.com/machadop1407/react-hooks-course/HEAD/public/logo192.png


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/public/logo512.png:
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https://raw.githubusercontent.com/machadop1407/react-hooks-course/HEAD/public/logo512.png


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/README.md:
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1 | # This Is a Repo With examples for each React Hook
2 | 
3 | ## This was made in the following youtube tutorial: [React Hooks Explained](https://youtu.be/LlvBzyy-558)
4 | 
5 | 


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/src/UseCallback/Child.js:
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 1 | import React, { useEffect } from "react";
 2 | 
 3 | function Child({ returnComment }) {
 4 |   useEffect(() => {
 5 |     console.log("FUNCTION WAS CALLED");
 6 |   }, [returnComment]);
 7 | 
 8 |   return <div>{returnComment("Pedro")}</div>;
 9 | }
10 | 
11 | export default Child;
12 | 


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/src/UseContext/User.js:
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 1 | import React, { useContext } from "react";
 2 | import { AppContext } from "./ContextTutorial";
 3 | 
 4 | function User() {
 5 |   const { username } = useContext(AppContext);
 6 | 
 7 |   return (
 8 |     <div>
 9 |       <h1>User: {username}</h1>
10 |     </div>
11 |   );
12 | }
13 | 
14 | export default User;
15 | 


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/.gitignore:
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 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 2 | 
 3 | # dependencies
 4 | /node_modules
 5 | /.pnp
 6 | .pnp.js
 7 | 
 8 | # testing
 9 | /coverage
10 | 
11 | # production
12 | /build
13 | 
14 | # misc
15 | .DS_Store
16 | .env.local
17 | .env.development.local
18 | .env.test.local
19 | .env.production.local
20 | 
21 | npm-debug.log*
22 | yarn-debug.log*
23 | yarn-error.log*
24 | 


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/src/UseContext/Login.js:
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 1 | import React, { useContext } from "react";
 2 | import { AppContext } from "./ContextTutorial";
 3 | 
 4 | function Login() {
 5 |   const { setUsername } = useContext(AppContext);
 6 | 
 7 |   return (
 8 |     <div>
 9 |       <input
10 |         onChange={(event) => {
11 |           setUsername(event.target.value);
12 |         }}
13 |       />
14 |     </div>
15 |   );
16 | }
17 | 
18 | export default Login;
19 | 


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/src/reportWebVitals.js:
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 1 | const reportWebVitals = onPerfEntry => {
 2 |   if (onPerfEntry && onPerfEntry instanceof Function) {
 3 |     import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
 4 |       getCLS(onPerfEntry);
 5 |       getFID(onPerfEntry);
 6 |       getFCP(onPerfEntry);
 7 |       getLCP(onPerfEntry);
 8 |       getTTFB(onPerfEntry);
 9 |     });
10 |   }
11 | };
12 | 
13 | export default reportWebVitals;
14 | 


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/src/UseRef/RefTutorial.js:
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 1 | import React, { useRef } from "react";
 2 | 
 3 | function RefTutorial() {
 4 |   const inputRef = useRef(null);
 5 | 
 6 |   const onClick = () => {
 7 |     inputRef.current.value = "";
 8 |   };
 9 |   return (
10 |     <div>
11 |       <h1>Pedro</h1>
12 |       <input type="text" placeholder="Ex..." ref={inputRef} />
13 |       <button onClick={onClick}>Change Name</button>
14 |     </div>
15 |   );
16 | }
17 | 
18 | export default RefTutorial;
19 | 


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/src/UseContext/ContextTutorial.js:
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 1 | import React, { useState, createContext } from "react";
 2 | import Login from "./Login";
 3 | import User from "./User";
 4 | 
 5 | export const AppContext = createContext(null);
 6 | 
 7 | function ContextTutorial() {
 8 |   const [username, setUsername] = useState("");
 9 | 
10 |   return (
11 |     <AppContext.Provider value={{ username, setUsername }}>
12 |       <Login /> <User />
13 |     </AppContext.Provider>
14 |   );
15 | }
16 | 
17 | export default ContextTutorial;
18 | 


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/src/UseState/StateTutorial.js:
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 1 | import React, { useState } from "react";
 2 | 
 3 | const StateTutorial = () => {
 4 |   const [inputValue, setInputValue] = useState("Pedro");
 5 | 
 6 |   let onChange = (event) => {
 7 |     const newValue = event.target.value;
 8 |     setInputValue(newValue);
 9 |   };
10 | 
11 |   return (
12 |     <div>
13 |       <input placeholder="enter something..." onChange={onChange} />
14 |       {inputValue}
15 |     </div>
16 |   );
17 | };
18 | 
19 | export default StateTutorial;
20 | 


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/src/UseImperativeHandle/Button.js:
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 1 | import React, { forwardRef, useImperativeHandle, useState } from "react";
 2 | 
 3 | const Button = forwardRef((props, ref) => {
 4 |   const [toggle, setToggle] = useState(false);
 5 | 
 6 |   useImperativeHandle(ref, () => ({
 7 |     alterToggle() {
 8 |       setToggle(!toggle);
 9 |     },
10 |   }));
11 |   return (
12 |     <>
13 |       <button>Button From Child</button>
14 |       {toggle && <span>Toggle</span>}
15 |     </>
16 |   );
17 | });
18 | 
19 | export default Button;
20 | 


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/src/UseImperativeHandle/ImperativeHandle.js:
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 1 | import React, { useRef } from "react";
 2 | import Button from "./Button";
 3 | 
 4 | function ImperativeHandle() {
 5 |   const buttonRef = useRef(null);
 6 |   return (
 7 |     <div>
 8 |       <button
 9 |         onClick={() => {
10 |           buttonRef.current.alterToggle();
11 |         }}
12 |       >
13 |         Button From Parent
14 |       </button>
15 |       <Button ref={buttonRef} />
16 |     </div>
17 |   );
18 | }
19 | 
20 | export default ImperativeHandle;
21 | 


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/src/index.js:
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 1 | import React from "react";
 2 | import ReactDOM from "react-dom";
 3 | import App from "./App";
 4 | import reportWebVitals from "./reportWebVitals";
 5 | 
 6 | ReactDOM.render(
 7 |   <React.StrictMode>
 8 |     <App />
 9 |   </React.StrictMode>,
10 |   document.getElementById("root")
11 | );
12 | 
13 | // If you want to start measuring performance in your app, pass a function
14 | // to log results (for example: reportWebVitals(console.log))
15 | // or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
16 | reportWebVitals();
17 | 


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/src/UseLayoutEffect/LayoutEffectTutorial.js:
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 1 | import { useLayoutEffect, useEffect, useRef } from "react";
 2 | 
 3 | function LayoutEffectTutorial() {
 4 |   const inputRef = useRef(null);
 5 | 
 6 |   useLayoutEffect(() => {
 7 |     console.log(inputRef.current.value);
 8 |   }, []);
 9 | 
10 |   useEffect(() => {
11 |     inputRef.current.value = "HELLO";
12 |   }, []);
13 | 
14 |   return (
15 |     <div className="App">
16 |       <input ref={inputRef} value="PEDRO" style={{ width: 400, height: 60 }} />
17 |     </div>
18 |   );
19 | }
20 | 
21 | export default LayoutEffectTutorial;
22 | 


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/public/manifest.json:
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 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     },
10 |     {
11 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


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/src/App.js:
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 1 | import "./App.css";
 2 | import EffectTutorial from "./UseEffect/EffectTutorial";
 3 | import ReducerTutorial from "./UseReducer/ReducerTutorial";
 4 | import StateTutorial from "./UseState/StateTutorial";
 5 | import ContextTutorial from "./UseContext/ContextTutorial";
 6 | import ImperativeHandle from "./UseImperativeHandle/ImperativeHandle";
 7 | import RefTutorial from "./UseRef/RefTutorial";
 8 | import MemoTutorial from "./UseMemo/MemoTutorial";
 9 | import CallBackTutorial from "./UseCallback/CallbackTutorial";
10 | 
11 | function App() {
12 |   return (
13 |     <div className="App">
14 |       <StateTutorial />
15 |     </div>
16 |   );
17 | }
18 | 
19 | export default App;
20 | 


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/src/App.css:
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 1 | .App {
 2 |   text-align: center;
 3 |   font-family: Arial, Helvetica, sans-serif;
 4 | }
 5 | 
 6 | .App-logo {
 7 |   height: 40vmin;
 8 |   pointer-events: none;
 9 | }
10 | 
11 | @media (prefers-reduced-motion: no-preference) {
12 |   .App-logo {
13 |     animation: App-logo-spin infinite 20s linear;
14 |   }
15 | }
16 | 
17 | .App-header {
18 |   background-color: #282c34;
19 |   min-height: 100vh;
20 |   display: flex;
21 |   flex-direction: column;
22 |   align-items: center;
23 |   justify-content: center;
24 |   font-size: calc(10px + 2vmin);
25 |   color: white;
26 | }
27 | 
28 | .App-link {
29 |   color: #61dafb;
30 | }
31 | 
32 | @keyframes App-logo-spin {
33 |   from {
34 |     transform: rotate(0deg);
35 |   }
36 |   to {
37 |     transform: rotate(360deg);
38 |   }
39 | }
40 | 


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/src/UseCallback/CallbackTutorial.js:
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 1 | import axios from "axios";
 2 | import { useCallback, useState } from "react";
 3 | import Child from "./Child";
 4 | 
 5 | export default function CallBackTutorial() {
 6 |   const [toggle, setToggle] = useState(false);
 7 |   const [data, setData] = useState("Yo, pls sub to the channel!");
 8 | 
 9 |   const returnComment = useCallback(
10 |     (name) => {
11 |       return data + name;
12 |     },
13 |     [data]
14 |   );
15 | 
16 |   return (
17 |     <div className="App">
18 |       <Child returnComment={returnComment} />
19 | 
20 |       <button
21 |         onClick={() => {
22 |           setToggle(!toggle);
23 |         }}
24 |       >
25 |         {" "}
26 |         Toggle
27 |       </button>
28 |       {toggle && <h1> toggle </h1>}
29 |     </div>
30 |   );
31 | }
32 | 


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/src/UseEffect/EffectTutorial.js:
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 1 | import React, { useEffect, useState } from "react";
 2 | import axios from "axios";
 3 | 
 4 | function EffectTutorial() {
 5 |   const [data, setData] = useState("");
 6 |   const [count, setCount] = useState(0);
 7 | 
 8 |   useEffect(() => {
 9 |     axios
10 |       .get("https://jsonplaceholder.typicode.com/comments")
11 |       .then((response) => {
12 |         setData(response.data[0].email);
13 |         console.log("API WAS CALLED");
14 |       });
15 |   }, []);
16 | 
17 |   return (
18 |     <div>
19 |       Hello World
20 |       <h1>{data}</h1>
21 |       <h1>{count}</h1>
22 |       <button
23 |         onClick={() => {
24 |           setCount(count + 1);
25 |         }}
26 |       >
27 |         Click
28 |       </button>
29 |     </div>
30 |   );
31 | }
32 | 
33 | export default EffectTutorial;
34 | 


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/src/UseReducer/ReducerTutorial.js:
--------------------------------------------------------------------------------
 1 | import React, { useReducer } from "react";
 2 | 
 3 | const reducer = (state, action) => {
 4 |   switch (action.type) {
 5 |     case "INCREMENT":
 6 |       return { count: state.count + 1, showText: state.showText };
 7 |     case "toggleShowText":
 8 |       return { count: state.count, showText: !state.showText };
 9 |     default:
10 |       return state;
11 |   }
12 | };
13 | 
14 | const ReducerTutorial = () => {
15 |   const [state, dispatch] = useReducer(reducer, { count: 0, showText: true });
16 | 
17 |   return (
18 |     <div>
19 |       <h1>{state.count}</h1>
20 |       <button
21 |         onClick={() => {
22 |           dispatch({ type: "INCREMENT" });
23 |           dispatch({ type: "toggleShowText" });
24 |         }}
25 |       >
26 |         Click Here
27 |       </button>
28 | 
29 |       {state.showText && <p>This is a text</p>}
30 |     </div>
31 |   );
32 | };
33 | 
34 | export default ReducerTutorial;
35 | 


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/package.json:
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 1 | {
 2 |   "name": "react-hooks-course",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@testing-library/jest-dom": "^5.11.4",
 7 |     "@testing-library/react": "^11.1.0",
 8 |     "@testing-library/user-event": "^12.1.10",
 9 |     "axios": "^0.21.1",
10 |     "react": "^17.0.2",
11 |     "react-dom": "^17.0.2",
12 |     "react-scripts": "4.0.3",
13 |     "web-vitals": "^1.0.1"
14 |   },
15 |   "scripts": {
16 |     "start": "react-scripts start",
17 |     "build": "react-scripts build",
18 |     "test": "react-scripts test",
19 |     "eject": "react-scripts eject"
20 |   },
21 |   "eslintConfig": {
22 |     "extends": [
23 |       "react-app",
24 |       "react-app/jest"
25 |     ]
26 |   },
27 |   "browserslist": {
28 |     "production": [
29 |       ">0.2%",
30 |       "not dead",
31 |       "not op_mini all"
32 |     ],
33 |     "development": [
34 |       "last 1 chrome version",
35 |       "last 1 firefox version",
36 |       "last 1 safari version"
37 |     ]
38 |   }
39 | }
40 | 


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/src/UseMemo/MemoTutorial.js:
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 1 | import axios from "axios";
 2 | import { useEffect, useState, useMemo } from "react";
 3 | 
 4 | export default function MemoTutorial() {
 5 |   const [data, setData] = useState(null);
 6 |   const [toggle, setToggle] = useState(false);
 7 | 
 8 |   useEffect(() => {
 9 |     axios
10 |       .get("https://jsonplaceholder.typicode.com/comments")
11 |       .then((response) => {
12 |         setData(response.data);
13 |       });
14 |   }, []);
15 | 
16 |   const findLongestName = (comments) => {
17 |     if (!comments) return null;
18 | 
19 |     let longestName = "";
20 |     for (let i = 0; i < comments.length; i++) {
21 |       let currentName = comments[i].name;
22 |       if (currentName.length > longestName.length) {
23 |         longestName = currentName;
24 |       }
25 |     }
26 | 
27 |     console.log("THIS WAS COMPUTED");
28 | 
29 |     return longestName;
30 |   };
31 | 
32 |   const getLongestName = useMemo(() => findLongestName(data), [toggle]);
33 | 
34 |   return (
35 |     <div className="App">
36 |       <div> {getLongestName} </div>
37 | 
38 |       <button
39 |         onClick={() => {
40 |           setToggle(!toggle);
41 |         }}
42 |       >
43 |         {" "}
44 |         Toggle
45 |       </button>
46 |       {toggle && <h1> toggle </h1>}
47 |     </div>
48 |   );
49 | }
50 | 


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/public/index.html:
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 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 7 |     <meta name="theme-color" content="#000000" />
 8 |     <meta
 9 |       name="description"
10 |       content="Web site created using create-react-app"
11 |     />
12 |     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
13 |     <!--
14 |       manifest.json provides metadata used when your web app is installed on a
15 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
16 |     -->
17 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
18 |     <!--
19 |       Notice the use of %PUBLIC_URL% in the tags above.
20 |       It will be replaced with the URL of the `public` folder during the build.
21 |       Only files inside the `public` folder can be referenced from the HTML.
22 | 
23 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
24 |       work correctly both with client-side routing and a non-root public URL.
25 |       Learn how to configure a non-root public URL by running `npm run build`.
26 |     -->
27 |     <title>React App</title>
28 |   </head>
29 |   <body>
30 |     <noscript>You need to enable JavaScript to run this app.</noscript>
31 |     <div id="root"></div>
32 |     <!--
33 |       This HTML file is a template.
34 |       If you open it directly in the browser, you will see an empty page.
35 | 
36 |       You can add webfonts, meta tags, or analytics to this file.
37 |       The build step will place the bundled scripts into the <body> tag.
38 | 
39 |       To begin the development, run `npm start` or `yarn start`.
40 |       To create a production bundle, use `npm run build` or `yarn build`.
41 |     -->
42 |   </body>
43 | </html>
44 | 


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