├── public
    ├── robots.txt
    ├── favicon.ico
    ├── logo192.png
    ├── logo512.png
    ├── manifest.json
    └── index.html
├── .vscode
    └── settings.json
├── src
    ├── setupTests.js
    ├── App.test.js
    ├── index.css
    ├── reportWebVitals.js
    ├── components
    │   ├── UnitControl.js
    │   ├── CardFooter.js
    │   └── UnitConverter.js
    ├── index.js
    ├── App.js
    ├── App.css
    ├── logo.svg
    └── serviceWorker.js
├── .gitignore
├── package.json
├── README.md
├── .eslintcache
└── template.html


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


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/.vscode/settings.json:
--------------------------------------------------------------------------------
1 | {
2 |   "cSpell.words": [
3 |     "Mbps",
4 |     "fontawesome",
5 |     "fortawesome"
6 |   ]
7 | }


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/public/favicon.ico:
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https://raw.githubusercontent.com/pjchender/learn-react-from-hooks-internet-speed-converter/HEAD/public/favicon.ico


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/public/logo192.png:
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https://raw.githubusercontent.com/pjchender/learn-react-from-hooks-internet-speed-converter/HEAD/public/logo192.png


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/public/logo512.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/pjchender/learn-react-from-hooks-internet-speed-converter/HEAD/public/logo512.png


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/src/setupTests.js:
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1 | // jest-dom adds custom jest matchers for asserting on DOM nodes.
2 | // allows you to do things like:
3 | // expect(element).toHaveTextContent(/react/i)
4 | // learn more: https://github.com/testing-library/jest-dom
5 | import '@testing-library/jest-dom/extend-expect';
6 | 


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/src/App.test.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { render } from '@testing-library/react';
 3 | import App from './App';
 4 | 
 5 | test('renders learn react link', () => {
 6 |   const { getByText } = render(<App />);
 7 |   const linkElement = getByText(/learn react/i);
 8 |   expect(linkElement).toBeInTheDocument();
 9 | });
10 | 


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/.gitignore:
--------------------------------------------------------------------------------
 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 | 


--------------------------------------------------------------------------------
/src/index.css:
--------------------------------------------------------------------------------
 1 | body {
 2 |   margin: 0;
 3 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 4 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 5 |     sans-serif;
 6 |   -webkit-font-smoothing: antialiased;
 7 |   -moz-osx-font-smoothing: grayscale;
 8 | }
 9 | 
10 | code {
11 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
12 |     monospace;
13 | }
14 | 


--------------------------------------------------------------------------------
/src/reportWebVitals.js:
--------------------------------------------------------------------------------
 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 | 


--------------------------------------------------------------------------------
/src/components/UnitControl.js:
--------------------------------------------------------------------------------
 1 | import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 2 | import React from 'react';
 3 | 
 4 | const UnitControl = () => (
 5 |   <div className="unit-control">
 6 |     <div className="unit">Mbps</div>
 7 |     <span className="exchange-icon fa-fw fa-stack">
 8 |       <FontAwesomeIcon icon={['far', 'circle']} className="fa-stack-2x" />
 9 |       <FontAwesomeIcon icon={['fas', 'exchange-alt']} className="fa-stack-1x" />
10 |     </span>
11 |     <div className="unit">MB/s</div>
12 |   </div>
13 | );
14 | 
15 | export default UnitControl;
16 | 


--------------------------------------------------------------------------------
/src/index.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom/client';
 3 | import './index.css';
 4 | import App from './App';
 5 | import reportWebVitals from './reportWebVitals';
 6 | 
 7 | const root = ReactDOM.createRoot(document.getElementById('root'));
 8 | root.render(
 9 |   <React.StrictMode>
10 |     <App />
11 |   </React.StrictMode>
12 | );
13 | 
14 | // If you want to start measuring performance in your app, pass a function
15 | // to log results (for example: reportWebVitals(console.log))
16 | // or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
17 | reportWebVitals();
18 | 


--------------------------------------------------------------------------------
/public/manifest.json:
--------------------------------------------------------------------------------
 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 | 


--------------------------------------------------------------------------------
/src/components/CardFooter.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | 
 3 | const CardFooter = (props) => {
 4 |   const { inputValue } = props;
 5 | 
 6 |   let criteria = {};
 7 | 
 8 |   if (!inputValue) {
 9 |     criteria = {
10 |       title: '---',
11 |       backgroundColor: '#d3d8e2',
12 |     };
13 |   } else if (inputValue < 15) {
14 |     criteria = {
15 |       title: 'SLOW',
16 |       backgroundColor: '#ee362d',
17 |     };
18 |   } else if (inputValue < 40) {
19 |     criteria = {
20 |       title: 'GOOD',
21 |       backgroundColor: '#1b82f1',
22 |     };
23 |   } else if (inputValue >= 40) {
24 |     criteria = {
25 |       title: 'FAST',
26 |       backgroundColor: '#13d569',
27 |     };
28 |   }
29 | 
30 |   return (
31 |     <div
32 |       className="card-footer"
33 |       style={{
34 |         backgroundColor: criteria.backgroundColor,
35 |       }}
36 |     >
37 |       {criteria.title}
38 |     </div>
39 |   );
40 | };
41 | 
42 | export default CardFooter;
43 | 


--------------------------------------------------------------------------------
/src/components/UnitConverter.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 3 | 
 4 | const UnitConverter = ({ handleInputChange, inputValue }) => (
 5 |   <div className="converter">
 6 |     <div className="flex-1">
 7 |       <div className="converter-title">Set</div>
 8 |       <input
 9 |         type="number"
10 |         onChange={handleInputChange}
11 |         value={inputValue}
12 |         className="input-number"
13 |         min="0"
14 |       />
15 |     </div>
16 |     <span className="angle-icon fa-2x" style={{ marginTop: 30 }}>
17 |       <FontAwesomeIcon icon={['fas', 'angle-right']} />
18 |     </span>
19 |     <div className="text-right flex-1">
20 |       <div className="converter-title">Show</div>
21 |       <input
22 |         type="text"
23 |         className="input-number text-right"
24 |         disabled
25 |         value={inputValue / 8}
26 |       />
27 |     </div>
28 |   </div>
29 | );
30 | 
31 | export default UnitConverter;
32 | 


--------------------------------------------------------------------------------
/src/App.js:
--------------------------------------------------------------------------------
 1 | import './App.css';
 2 | 
 3 | import { useState } from 'react';
 4 | 
 5 | import CardFooter from './components/CardFooter';
 6 | import UnitControl from './components/UnitControl';
 7 | import UnitConverter from './components/UnitConverter';
 8 | import { fab } from '@fortawesome/free-brands-svg-icons';
 9 | import { far } from '@fortawesome/free-regular-svg-icons';
10 | import { fas } from '@fortawesome/free-solid-svg-icons';
11 | import { library } from '@fortawesome/fontawesome-svg-core';
12 | 
13 | library.add(fab, fas, far);
14 | 
15 | function App() {
16 |   const [inputValue, setInputValue] = useState(0);
17 | 
18 |   const handleInputChange = (e) => {
19 |     const { value } = e.target;
20 |     setInputValue(value);
21 |   };
22 | 
23 |   return (
24 |     <div className="container">
25 |       <div className="card-header">Network Speed Converter</div>
26 |       <div className="card-body">
27 |         <UnitControl />
28 |         <UnitConverter
29 |           inputValue={inputValue}
30 |           handleInputChange={handleInputChange}
31 |         />
32 |       </div>
33 |       <CardFooter inputValue={inputValue} />
34 |     </div>
35 |   );
36 | }
37 | 
38 | export default App;
39 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "internet-speed-converter",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@fortawesome/fontawesome-free": "^5.15.1",
 7 |     "@fortawesome/fontawesome-svg-core": "^1.2.32",
 8 |     "@fortawesome/free-brands-svg-icons": "^5.15.1",
 9 |     "@fortawesome/free-regular-svg-icons": "^5.15.1",
10 |     "@fortawesome/free-solid-svg-icons": "^5.15.1",
11 |     "@fortawesome/react-fontawesome": "^0.1.14",
12 |     "@testing-library/jest-dom": "^5.16.5",
13 |     "@testing-library/react": "^13.3.0",
14 |     "@testing-library/user-event": "^13.5.0",
15 |     "react": "^18.2.0",
16 |     "react-dom": "^18.2.0",
17 |     "react-scripts": "5.0.1",
18 |     "web-vitals": "^2.1.4"
19 |   },
20 |   "scripts": {
21 |     "start": "react-scripts start",
22 |     "build": "react-scripts build",
23 |     "test": "react-scripts test",
24 |     "eject": "react-scripts eject"
25 |   },
26 |   "eslintConfig": {
27 |     "extends": "react-app"
28 |   },
29 |   "browserslist": {
30 |     "production": [
31 |       ">0.2%",
32 |       "not dead",
33 |       "not op_mini all"
34 |     ],
35 |     "development": [
36 |       "last 1 chrome version",
37 |       "last 1 firefox version",
38 |       "last 1 safari version"
39 |     ]
40 |   }
41 | }
42 | 


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/README.md:
--------------------------------------------------------------------------------
 1 | # 網速傻傻分不清楚 Mbps? MB/s? 來寫個單位換算器吧
 2 | 
 3 | ## 網速的概念
 4 | 
 5 | 在開始實作前，我們要先來了解一下網速的概念。其中，`Mbps` 是用來計算網路頻寬最常見的單位，自從大家升級到 4G 行動網路，甚至即將邁入的 5G，如果你不是使用吃到飽的使用者，勢必會看到「降速」或「限速」這兩個詞，可是你有想過最常見的降速 `20Mbps`、或者限速 `5Mbps` 是什麼意思嗎？
 6 | 
 7 | 但因為最常接觸到的單位常常是 `MB`，因為這常用在傳輸檔案或儲存空間上。因此有些不太清楚的店員可能會跟你說 `20Mbps` 就是每秒鐘有 `20MB` 的網路傳輸速度，但真的是這樣嗎？錯！**20Mbps 完全不等於每秒鐘有 20MB 的網路傳輸量**。
 8 | 
 9 | ![imgur](https://i.imgur.com/H9dBJNF.png)
10 | 
11 | 又或者你現在想要追一下最近很紅的韓劇，怕網速太慢影響看劇的興致，於是打開 Netflix 提供的測速網站 [fast.com](https://fast.com/) 想要測一下網速：
12 | 
13 | ![imgur](https://i.imgur.com/87jdVjv.png)
14 | 
15 | 測完發現有 `300Mbps`，可是你有想過，這個 `300Mbps` 是什麼意思嗎？這絕對不是表示每秒鐘有 300MB 的網路頻寬。
16 | 
17 | `Mbps` 和 `MB/s` 雖然不同，但這兩個單位之間是可以轉換的。那麼多少 `Mbps` 才會等於 `1 MB/s` 呢？
18 | 
19 | ## Mbps 或 MB/s
20 | 
21 | 要做網速單位換算器之前，我們要先來了解 `Mbps` 到底是什麼意思，它又要怎麼轉換成 `MB/s`。
22 | 
23 | 實際上 `Mbps` 中的第一個 `M` 是英文的 million，也就是「百萬」； `小寫 b` 是 `bit` 的意思，中文稱作「**位元**」；後面的 `ps` 則是 per second 的意思，也就是「每秒」。綜合起來，**`Mbps` 指的是「每秒鐘可以傳輸多少百萬位元（Million bits per second）」**。
24 | 
25 | 那 `MB/s` 呢？這裡第一個 `M` 一樣式 million 百萬的意思；但 `B` 則是大寫的 `B` ，**大寫的 B 和小寫的 b 在意思上是完全不同的**，`大寫 B` 是指 `Byte` ，中文稱作「**位元組**」。**一個位元組（Byte）需要由 8 個位元（bit）所組成的**。
26 | 
27 | 所以實際上 **`Mbps` 的值需要「除以 8 」後才會是指每秒鐘可以有多少 MB 的傳輸量**。也就是說至少要到 `8Mbps` 以上，才表示你的網路速度每秒鐘可以傳輸 `1MB` 以上：
28 | 
29 | ![imgur](https://i.imgur.com/4Uglubs.png)
30 | 
31 | 在這個章節中就讓我們來做一個網速單位換算器吧！
32 | 
33 | ![imgur](https://i.imgur.com/YuQvUMP.png)
34 | 
35 | ## 網速單位換算器 UI
36 | 
37 | [https://codepen.io/PJCHENder/pen/LYGbzxz](https://codepen.io/PJCHENder/pen/LYGbzxz)
38 | 
39 | ## 安裝 FontAwesome
40 | 
41 | ```bash
42 | $ npm i --save @fortawesome/fontawesome-svg-core @fortawesome/react- fontawesome @fortawesome/free-regular-svg-icons @fortawesome/free- brands-svg-icons @fortawesome/free-solid-svg-icons
43 | ```
44 | 


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/public/index.html:
--------------------------------------------------------------------------------
 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 | 


--------------------------------------------------------------------------------
/src/App.css:
--------------------------------------------------------------------------------
  1 | /**
  2 | * Design Credit:
  3 | * https://dribbble.com/shots/4241423-Exchanger-landing-page
  4 | **/
  5 | 
  6 | html,
  7 | body {
  8 |   margin: 0;
  9 |   padding: 0;
 10 |   height: 100%;
 11 |   width: 100%;
 12 |   display: flex;
 13 |   align-items: center;
 14 |   justify-content: center;
 15 |   font-family: Verdana;
 16 |   background: #1b6ca8;
 17 |   background: linear-gradient(237deg, #134c76 48%, #175c8f 85%, #186197 100%);
 18 | }
 19 | 
 20 | .container {
 21 |   display: flex;
 22 |   flex-direction: column;
 23 |   box-shadow: 1px 1px 10px 1px #134c76;
 24 |   border-radius: 7px;
 25 |   background: white;
 26 |   min-width: 440px;
 27 |   min-height: 320px;
 28 | }
 29 | 
 30 | .card-header {
 31 |   display: flex;
 32 |   align-items: center;
 33 |   justify-content: center;
 34 |   min-height: 50px;
 35 |   border-top-left-radius: 6px;
 36 |   border-top-right-radius: 6px;
 37 |   background-color: #0a97b0;
 38 |   color: white;
 39 |   font-size: 20px;
 40 | }
 41 | 
 42 | .card-body {
 43 |   flex: 1;
 44 |   padding: 30px;
 45 | }
 46 | 
 47 | .unit-control {
 48 |   display: flex;
 49 |   align-items: center;
 50 |   justify-content: space-between;
 51 |   margin-bottom: 45px;
 52 | }
 53 | 
 54 | .unit {
 55 |   display: inline-flex;
 56 |   background-color: #0a97b0;
 57 |   align-items: center;
 58 |   justify-content: center;
 59 |   width: 75px;
 60 |   height: 35px;
 61 |   color: white;
 62 |   border-radius: 3px;
 63 | }
 64 | 
 65 | .exchange-icon {
 66 |   color: #6886c5;
 67 | }
 68 | 
 69 | .angle-icon {
 70 |   color: #6886c5;
 71 | }
 72 | 
 73 | .converter {
 74 |   display: flex;
 75 |   align-items: center;
 76 |   justify-content: space-between;
 77 | }
 78 | 
 79 | .converter-title {
 80 |   color: #6886c5;
 81 |   font-weight: bold;
 82 |   margin-bottom: 12px;
 83 | }
 84 | 
 85 | .card-footer {
 86 |   min-height: 40px;
 87 |   margin: 5px;
 88 |   border-bottom-left-radius: 6px;
 89 |   border-bottom-right-radius: 6px;
 90 |   background-color: #0a97b0;
 91 |   display: flex;
 92 |   align-items: center;
 93 |   justify-content: center;
 94 |   color: white;
 95 | }
 96 | 
 97 | .input-number {
 98 |   font-size: 32px;
 99 |   max-width: 170px;
100 |   flex: 1;
101 |   display: inline-block;
102 |   background: transparent;
103 |   border: none;
104 |   outline: none;
105 |   font-family: Courier;
106 |   color: #0a97b0;
107 |   font-weight: bold;
108 | }
109 | 
110 | .text-right {
111 |   text-align: right;
112 | }
113 | 
114 | .flex-1 {
115 |   flex: 1;
116 | }
117 | 


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/.eslintcache:
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2 |     <g fill="#61DAFB">
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4 |         <circle cx="420.9" cy="296.5" r="45.7"/>
5 |         <path d="M520.5 78.1z"/>
6 |     </g>
7 | </svg>
8 | 


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/template.html:
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  1 | <!DOCTYPE html>
  2 | <html lang="en">
  3 | 
  4 | <head>
  5 |   <meta charset="UTF-8">
  6 |   <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7 |   <title>Document</title>
  8 |   <style>
  9 |     /**
 10 |      * Design Credit:
 11 |      * https://dribbble.com/shots/4241423-Exchanger-landing-page
 12 |      **/
 13 | 
 14 |     html,
 15 |     body {
 16 |       margin: 0;
 17 |       padding: 0;
 18 |       height: 100%;
 19 |       width: 100%;
 20 |       display: flex;
 21 |       align-items: center;
 22 |       justify-content: center;
 23 |       font-family: Verdana;
 24 |       background: #1b6ca8;
 25 |       background: linear-gradient(237deg,
 26 |           #134c76 48%,
 27 |           #175c8f 85%,
 28 |           #186197 100%);
 29 |     }
 30 | 
 31 |     .container {
 32 |       display: flex;
 33 |       flex-direction: column;
 34 |       box-shadow: 1px 1px 10px 1px #134c76;
 35 |       border-radius: 7px;
 36 |       background: white;
 37 |       min-width: 440px;
 38 |       min-height: 320px;
 39 |     }
 40 | 
 41 |     .card-header {
 42 |       display: flex;
 43 |       align-items: center;
 44 |       justify-content: center;
 45 |       min-height: 50px;
 46 |       border-top-left-radius: 6px;
 47 |       border-top-right-radius: 6px;
 48 |       background-color: #0a97b0;
 49 |       color: white;
 50 |       font-size: 20px;
 51 |     }
 52 | 
 53 |     .card-body {
 54 |       flex: 1;
 55 |       padding: 30px;
 56 |     }
 57 | 
 58 |     .unit-control {
 59 |       display: flex;
 60 |       align-items: center;
 61 |       justify-content: space-between;
 62 |       margin-bottom: 45px;
 63 |     }
 64 | 
 65 |     .unit {
 66 |       display: inline-flex;
 67 |       background-color: #0a97b0;
 68 |       align-items: center;
 69 |       justify-content: center;
 70 |       width: 75px;
 71 |       height: 35px;
 72 |       color: white;
 73 |       border-radius: 3px;
 74 |     }
 75 | 
 76 |     .exchange-icon {
 77 |       color: #6886c5;
 78 |     }
 79 | 
 80 |     .angle-icon {
 81 |       color: #6886c5;
 82 |     }
 83 | 
 84 |     .converter {
 85 |       display: flex;
 86 |       align-items: center;
 87 |       justify-content: space-between;
 88 |     }
 89 | 
 90 |     .converter-title {
 91 |       color: #6886c5;
 92 |       font-weight: bold;
 93 |       margin-bottom: 12px;
 94 |     }
 95 | 
 96 |     .card-footer {
 97 |       min-height: 40px;
 98 |       margin: 5px;
 99 |       border-bottom-left-radius: 6px;
100 |       border-bottom-right-radius: 6px;
101 |       background-color: #0a97b0;
102 |       display: flex;
103 |       align-items: center;
104 |       justify-content: center;
105 |       color: white;
106 |     }
107 | 
108 |     .input-number {
109 |       font-size: 32px;
110 |       max-width: 170px;
111 |       flex: 1;
112 |       display: inline-block;
113 |       background: transparent;
114 |       border: none;
115 |       outline: none;
116 |       font-family: Courier;
117 |       color: #0a97b0;
118 |       font-weight: bold;
119 |     }
120 | 
121 |     .text-right {
122 |       text-align: right;
123 |     }
124 | 
125 |     .flex-1 {
126 |       flex: 1;
127 |     }
128 |   </style>
129 |   <script src="https://kit.fontawesome.com/8e97bcaa1f.js" crossorigin="anonymous"></script>
130 | </head>
131 | 
132 | <body>
133 |   <div class="container">
134 |     <div class="card-header">Network Speed Converter</div>
135 |     <div class="card-body">
136 |       <div class="unit-control">
137 |         <div class="unit">Mbps</div>
138 |         <span class="exchange-icon fa-fw fa-stack">
139 |           <i class="far fa-circle fa-stack-2x"></i>
140 |           <i class="fas fa-exchange-alt fa-stack-1x"></i>
141 |         </span>
142 |         <div class="unit">MB/s</div>
143 |       </div>
144 |       <div class="converter">
145 |         <div class="flex-1">
146 |           <div class="converter-title">Set</div>
147 |           <input type="number" class="input-number" min="0" />
148 |         </div>
149 |         <span class="angle-icon fa-2x" style="margin-top: 30px">
150 |           <i class="fas fa-angle-right"></i>
151 |         </span>
152 |         <div class="text-right flex-1">
153 |           <div class="converter-title">Show</div>
154 |           <input type="text" class="input-number text-right" disabled value="125" />
155 |         </div>
156 |       </div>
157 |     </div>
158 |     <div class="card-footer">FAST</div>
159 |   </div>
160 | </body>
161 | 
162 | </html>
163 | 


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/src/serviceWorker.js:
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  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read https://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.0/8 are considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | export function register(config) {
 24 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 25 |     // The URL constructor is available in all browsers that support SW.
 26 |     const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
 27 |     if (publicUrl.origin !== window.location.origin) {
 28 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 29 |       // from what our page is served on. This might happen if a CDN is used to
 30 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 31 |       return;
 32 |     }
 33 | 
 34 |     window.addEventListener('load', () => {
 35 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 36 | 
 37 |       if (isLocalhost) {
 38 |         // This is running on localhost. Let's check if a service worker still exists or not.
 39 |         checkValidServiceWorker(swUrl, config);
 40 | 
 41 |         // Add some additional logging to localhost, pointing developers to the
 42 |         // service worker/PWA documentation.
 43 |         navigator.serviceWorker.ready.then(() => {
 44 |           console.log(
 45 |             'This web app is being served cache-first by a service ' +
 46 |               'worker. To learn more, visit https://bit.ly/CRA-PWA'
 47 |           );
 48 |         });
 49 |       } else {
 50 |         // Is not localhost. Just register service worker
 51 |         registerValidSW(swUrl, config);
 52 |       }
 53 |     });
 54 |   }
 55 | }
 56 | 
 57 | function registerValidSW(swUrl, config) {
 58 |   navigator.serviceWorker
 59 |     .register(swUrl)
 60 |     .then(registration => {
 61 |       registration.onupdatefound = () => {
 62 |         const installingWorker = registration.installing;
 63 |         if (installingWorker == null) {
 64 |           return;
 65 |         }
 66 |         installingWorker.onstatechange = () => {
 67 |           if (installingWorker.state === 'installed') {
 68 |             if (navigator.serviceWorker.controller) {
 69 |               // At this point, the updated precached content has been fetched,
 70 |               // but the previous service worker will still serve the older
 71 |               // content until all client tabs are closed.
 72 |               console.log(
 73 |                 'New content is available and will be used when all ' +
 74 |                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
 75 |               );
 76 | 
 77 |               // Execute callback
 78 |               if (config && config.onUpdate) {
 79 |                 config.onUpdate(registration);
 80 |               }
 81 |             } else {
 82 |               // At this point, everything has been precached.
 83 |               // It's the perfect time to display a
 84 |               // "Content is cached for offline use." message.
 85 |               console.log('Content is cached for offline use.');
 86 | 
 87 |               // Execute callback
 88 |               if (config && config.onSuccess) {
 89 |                 config.onSuccess(registration);
 90 |               }
 91 |             }
 92 |           }
 93 |         };
 94 |       };
 95 |     })
 96 |     .catch(error => {
 97 |       console.error('Error during service worker registration:', error);
 98 |     });
 99 | }
100 | 
101 | function checkValidServiceWorker(swUrl, config) {
102 |   // Check if the service worker can be found. If it can't reload the page.
103 |   fetch(swUrl, {
104 |     headers: { 'Service-Worker': 'script' },
105 |   })
106 |     .then(response => {
107 |       // Ensure service worker exists, and that we really are getting a JS file.
108 |       const contentType = response.headers.get('content-type');
109 |       if (
110 |         response.status === 404 ||
111 |         (contentType != null && contentType.indexOf('javascript') === -1)
112 |       ) {
113 |         // No service worker found. Probably a different app. Reload the page.
114 |         navigator.serviceWorker.ready.then(registration => {
115 |           registration.unregister().then(() => {
116 |             window.location.reload();
117 |           });
118 |         });
119 |       } else {
120 |         // Service worker found. Proceed as normal.
121 |         registerValidSW(swUrl, config);
122 |       }
123 |     })
124 |     .catch(() => {
125 |       console.log(
126 |         'No internet connection found. App is running in offline mode.'
127 |       );
128 |     });
129 | }
130 | 
131 | export function unregister() {
132 |   if ('serviceWorker' in navigator) {
133 |     navigator.serviceWorker.ready
134 |       .then(registration => {
135 |         registration.unregister();
136 |       })
137 |       .catch(error => {
138 |         console.error(error.message);
139 |       });
140 |   }
141 | }
142 | 


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