commit
1f67de5c3b
20 changed files with 13819 additions and 0 deletions
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# See https://help.github.com/ignore-files/ for more about ignoring files. |
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# dependencies |
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/node_modules |
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# testing |
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/coverage |
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# production |
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/build |
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|
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# misc |
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.DS_Store |
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.env.local |
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.env.development.local |
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.env.test.local |
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.env.production.local |
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|
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npm-debug.log* |
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yarn-debug.log* |
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yarn-error.log* |
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{ |
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"name": "react-interview-code", |
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"version": "0.1.0", |
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"private": true, |
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"dependencies": { |
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"bootstrap": "^4.0.0", |
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"react": "^16.3.0", |
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"react-dom": "^16.3.0", |
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"react-scripts": "1.1.1" |
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}, |
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"scripts": { |
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"start": "react-scripts start", |
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"build": "react-scripts build", |
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"test": "react-scripts test --env=jsdom", |
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"eject": "react-scripts eject" |
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} |
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} |
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|
After Width: | Height: | Size: 3.8 KiB |
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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> |
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<meta name="theme-color" content="#000000"> |
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<!-- |
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manifest.json provides metadata used when your web app is added to the |
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homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/ |
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--> |
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json"> |
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<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico"> |
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<!-- |
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Notice the use of %PUBLIC_URL% in the tags above. |
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It will be replaced with the URL of the `public` folder during the build. |
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Only files inside the `public` folder can be referenced from the HTML. |
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|
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will |
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work correctly both with client-side routing and a non-root public URL. |
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Learn how to configure a non-root public URL by running `npm run build`. |
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--> |
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<title>React App</title> |
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</head> |
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<body> |
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<noscript> |
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You need to enable JavaScript to run this app. |
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</noscript> |
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<div id="root"></div> |
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<!-- |
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This HTML file is a template. |
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If you open it directly in the browser, you will see an empty page. |
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|
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You can add webfonts, meta tags, or analytics to this file. |
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The build step will place the bundled scripts into the <body> tag. |
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|
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To begin the development, run `npm start` or `yarn start`. |
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To create a production bundle, use `npm run build` or `yarn build`. |
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--> |
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</body> |
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</html> |
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{ |
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"short_name": "React App", |
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"name": "Create React App Sample", |
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"icons": [ |
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{ |
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"src": "favicon.ico", |
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"sizes": "64x64 32x32 24x24 16x16", |
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"type": "image/x-icon" |
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} |
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], |
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"start_url": "./index.html", |
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"display": "standalone", |
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"theme_color": "#000000", |
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"background_color": "#ffffff" |
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} |
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.comic-nav { |
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display: flex; |
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justify-content: space-between; |
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margin-bottom: 2rem; |
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} |
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.comic-image { |
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margin: 1.5rem auto; |
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max-width: 95%; |
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display: block; |
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} |
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import React from 'react'; |
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import './APIRequest.css'; |
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export default class APIRequest extends React.Component { |
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constructor(props) { |
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super(props);
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this.state = { |
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img: "", |
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maxNum: 0, |
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num: "", |
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alt: "", |
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title: "Loading Comic..." |
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}; |
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} |
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|
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componentDidMount() { |
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this.fetchComic().catch(e => { |
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console.error("Failed to fetch initial comic! : ", e); |
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}); |
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} |
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updateComicFromAPI(data) { |
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this.setState(old => { |
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if(old.num !== "" && old.num !== data.num) return {}; |
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return { |
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img: data.imgRetina ? data.imgRetina : data.img, |
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maxNum: data.num > old.maxNum ? data.num : old.maxNum, |
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num: data.num, |
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alt: data.alt, |
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title: data.title |
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}; |
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}); |
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} |
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|
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fetchComic() { |
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return fetch(`https://xkcd.now.sh/${this.state.num}`).then( |
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response => response.json() |
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).then(x => this.updateComicFromAPI(x)); |
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} |
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|
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fetchNext() { |
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this.setState(old => ({num: ++old.num}), () => { |
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this.fetchComic().catch( err => { |
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console.error("Error fetching next comic: ", err); |
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}); |
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}); |
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} |
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fetchPrevious() { |
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this.setState(old => ({num: --old.num}), () => { |
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this.fetchComic().catch( err => { |
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console.error("Error fetching prev comic: ", err); |
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}); |
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}); |
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} |
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|
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render() { |
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const s = this.state; |
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const prev = s.num > 0 ?
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<button className="btn" onClick={() => this.fetchPrevious()}>Previous</button> : |
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""; |
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const next = s.num < s.maxNum ? |
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<button className="btn" onClick={() => this.fetchNext()}>Next</button> : |
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""; |
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return <section className="card mt-3 comic-component" > |
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<div className="card-body"> |
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<p>This interviewer requested I write a component that makes an API |
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call and displays it. I did a bit more than that since it was more |
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fun and I think better deomnstrated my ability to make API calls.</p> |
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<div className="comic-nav">{prev}{next}</div> |
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<h5 className="card-title">{s.title}</h5> |
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{ s.img ? <img className="comic-image" src={s.img} title={s.alt} /> : "" } |
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<p>All comics from <a href="https://Xkcd.com">xkcd web comic</a></p> |
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</div> |
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</section>; |
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} |
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} |
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.App-header { |
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background-color: #222; |
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text-align: center; |
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height: 80px; |
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padding: 20px; |
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color: white; |
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} |
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.App-title { |
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font-size: 1.5em; |
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} |
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|
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h3 { |
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margin: 2rem 0 1rem 0; |
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} |
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|
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.finished-components { |
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padding-bottom: 5rem; |
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} |
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import React, { Component } from 'react'; |
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import './App.css'; |
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import '../node_modules/bootstrap/dist/css/bootstrap.min.css'; |
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import Calculator from './Calculator.js'; |
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import Fauxbonacci from './Fauxbonacci.js'; |
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import APIRequest from './APIRequest.js'; |
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|
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class App extends Component { |
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render() { |
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return ( |
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<div className="App container mt-3"> |
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<header className="App-header"> |
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<h1 className="App-title">Interview Problems</h1> |
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</header> |
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<div className="card"><div className="card-body"> |
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<p>As I have done interviews, I have been asked to create example components to test my ability to follow requirements and work with react. I've decided to save them here for display.</p> |
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</div></div> |
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<Calculator /> |
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<Fauxbonacci /> |
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<APIRequest /> |
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</div> |
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); |
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} |
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} |
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export default App; |
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import React from 'react'; |
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import ReactDOM from 'react-dom'; |
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import App from './App'; |
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it('renders without crashing', () => { |
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const div = document.createElement('div'); |
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ReactDOM.render(<App />, div); |
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ReactDOM.unmountComponentAtNode(div); |
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}); |
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.calc-number-input { |
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width: 4rem; |
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margin-right: 1rem; |
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text-align:center; |
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} |
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.calc-operator-input { |
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margin-right: 1rem; |
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} |
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.calc-answer { |
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margin-left: 1rem; |
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} |
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import React from 'react'; |
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import './Calculator.css'; |
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export default class Calculator extends React.Component { |
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constructor(props) { |
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super(props); |
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this.state = { |
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a: "", |
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b: "", |
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operator: "ADD" |
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} |
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} |
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calcResult({a, operator, b}) { |
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a = parseFloat(a); |
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b = parseFloat(b); |
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if(isNaN(a) || isNaN(b) || !operator) { |
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return ""; |
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} |
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switch(operator) { |
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case "ADD": |
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return a + b; |
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case "SUBTRACT": |
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return a - b; |
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case "MULTIPLY": |
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return a * b; |
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case "DIVIDE": |
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return a / b; |
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} |
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return ""; |
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} |
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|
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render() { |
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return <div className="card mt-3"><div className="card-body"> |
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<p>This interviewer requested that I make a component that allowed a user |
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to input two numbers and select an operator and get a result.</p> |
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<input className="calc-number-input" onChange={e => this.setState({a: e.target.value})} /> |
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<select className="calc-operator-input" onChange={e => this.setState({operator: e.target.value})}> |
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<option value="ADD">{String.fromCharCode(0x2B)}</option> |
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<option value="SUBTRACT">{String.fromCharCode(0x2D)}</option> |
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<option value="MULTIPLY">{String.fromCharCode(0xD7)}</option> |
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<option value="DIVIDE">{String.fromCharCode(0xF7)}</option> |
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</select> |
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<input className="calc-number-input" onChange={e => this.setState({b: e.target.value})} /> |
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= <span className="calc-answer">{this.calcResult(this.state)}</span> |
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</div></div>; |
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} |
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} |
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.faux-component { |
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font-size: 1.2rem; |
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} |
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|
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.faux-component input { |
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margin: 0 0.4rem; |
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width: 3em; |
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text-align: center; |
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} |
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import React from 'react'; |
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import './Fauxbonacci.css'; |
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export default class Fauxbonacci extends React.Component { |
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constructor(props) { |
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super(props); |
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this.state = {i: ""}; |
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} |
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|
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//pretty implementation but slooow.
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prettyButSlowFindByIndex(i) { |
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i = parseInt(i); |
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if(isNaN(i) || i < 0) return ""; |
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if(i === 0) return 7; |
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if(i === 1) return 5; |
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return this.findByIndex(i - 1) + this.findByIndex(i - 2); |
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} |
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|
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//much faster, but without proper tail calls, it still explodes the
|
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// callstack sometime before i == 10000 but by then the result isn't
|
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// very accurate due to limitation of javascript Number.
|
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fasterFindByIndex(i) { |
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if(i < 0 ) return "Range error..."; |
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if(i === 0) return 7; |
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if(i === 1) return 5; |
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|
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let answer = "Does not compute!"; |
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try { |
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answer = this.findByIndexHelper(i); |
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} catch(e) { |
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console.error(e); |
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} |
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return answer; |
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} |
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|
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findByIndexHelper(i, before = 5, beforeBefore = 7, runningIndex = 2) { |
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if(i === runningIndex) { |
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return before + beforeBefore; |
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} |
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return this.findByIndexHelper(i, before + beforeBefore, before, runningIndex + 1);
|
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} |
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|
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render() { |
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const safeI = parseInt(this.state.i); |
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const result = isNaN(safeI) ? "" : this.fasterFindByIndex(safeI); |
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const exact = !result || result < Number.MAX_SAFE_INTEGER; |
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|
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return <div className="card mt-3"><div className="card-body faux-component"> |
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<p>the interviewer requested a component that could accept a the index of a fibonacci sequence that started with 7 and 5 and output the value at that index in the sequence.</p> |
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<span className="faux-big-n">N</span><sub><input className="faux-number-input" onChange={(e) => this.setState({i: e.target.value})}/></sub>{exact ? "=" : String.fromCharCode(0x2248)} {result} |
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</div></div> |
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} |
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} |
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|
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body { |
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margin: 0; |
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padding: 0; |
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font-family: sans-serif; |
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} |
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import React from 'react'; |
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import ReactDOM from 'react-dom'; |
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import './index.css'; |
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import App from './App'; |
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import registerServiceWorker from './registerServiceWorker'; |
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|
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ReactDOM.render(<App />, document.getElementById('root')); |
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registerServiceWorker(); |
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// In production, we register a service worker to serve assets from local cache.
|
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|
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// This lets the app load faster on subsequent visits in production, and gives
|
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// it offline capabilities. However, it also means that developers (and users)
|
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// will only see deployed updates on the "N+1" visit to a page, since previously
|
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// cached resources are updated in the background.
|
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|
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// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
|
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// This link also includes instructions on opting out of this behavior.
|
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|
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const isLocalhost = Boolean( |
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window.location.hostname === 'localhost' || |
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// [::1] is the IPv6 localhost address.
|
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window.location.hostname === '[::1]' || |
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// 127.0.0.1/8 is considered localhost for IPv4.
|
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window.location.hostname.match( |
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ |
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) |
||||
); |
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|
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export default function register() { |
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { |
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// The URL constructor is available in all browsers that support SW.
|
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location); |
||||
if (publicUrl.origin !== window.location.origin) { |
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// Our service worker won't work if PUBLIC_URL is on a different origin
|
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// from what our page is served on. This might happen if a CDN is used to
|
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// serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
|
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return; |
||||
} |
||||
|
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window.addEventListener('load', () => { |
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; |
||||
|
||||
if (isLocalhost) { |
||||
// This is running on localhost. Lets check if a service worker still exists or not.
|
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checkValidServiceWorker(swUrl); |
||||
|
||||
// Add some additional logging to localhost, pointing developers to the
|
||||
// service worker/PWA documentation.
|
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navigator.serviceWorker.ready.then(() => { |
||||
console.log( |
||||
'This web app is being served cache-first by a service ' + |
||||
'worker. To learn more, visit https://goo.gl/SC7cgQ' |
||||
); |
||||
}); |
||||
} else { |
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// Is not local host. Just register service worker
|
||||
registerValidSW(swUrl); |
||||
} |
||||
}); |
||||
} |
||||
} |
||||
|
||||
function registerValidSW(swUrl) { |
||||
navigator.serviceWorker |
||||
.register(swUrl) |
||||
.then(registration => { |
||||
registration.onupdatefound = () => { |
||||
const installingWorker = registration.installing; |
||||
installingWorker.onstatechange = () => { |
||||
if (installingWorker.state === 'installed') { |
||||
if (navigator.serviceWorker.controller) { |
||||
// At this point, the old content will have been purged and
|
||||
// the fresh content will have been added to the cache.
|
||||
// It's the perfect time to display a "New content is
|
||||
// available; please refresh." message in your web app.
|
||||
console.log('New content is available; please refresh.'); |
||||
} else { |
||||
// At this point, everything has been precached.
|
||||
// It's the perfect time to display a
|
||||
// "Content is cached for offline use." message.
|
||||
console.log('Content is cached for offline use.'); |
||||
} |
||||
} |
||||
}; |
||||
}; |
||||
}) |
||||
.catch(error => { |
||||
console.error('Error during service worker registration:', error); |
||||
}); |
||||
} |
||||
|
||||
function checkValidServiceWorker(swUrl) { |
||||
// Check if the service worker can be found. If it can't reload the page.
|
||||
fetch(swUrl) |
||||
.then(response => { |
||||
// Ensure service worker exists, and that we really are getting a JS file.
|
||||
if ( |
||||
response.status === 404 || |
||||
response.headers.get('content-type').indexOf('javascript') === -1 |
||||
) { |
||||
// No service worker found. Probably a different app. Reload the page.
|
||||
navigator.serviceWorker.ready.then(registration => { |
||||
registration.unregister().then(() => { |
||||
window.location.reload(); |
||||
}); |
||||
}); |
||||
} else { |
||||
// Service worker found. Proceed as normal.
|
||||
registerValidSW(swUrl); |
||||
} |
||||
}) |
||||
.catch(() => { |
||||
console.log( |
||||
'No internet connection found. App is running in offline mode.' |
||||
); |
||||
}); |
||||
} |
||||
|
||||
export function unregister() { |
||||
if ('serviceWorker' in navigator) { |
||||
navigator.serviceWorker.ready.then(registration => { |
||||
registration.unregister(); |
||||
}); |
||||
} |
||||
} |
||||
Loading…
Reference in new issue