Added first set of interview components.
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1f67de5c3b
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.gitignore
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.gitignore
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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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# 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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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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10890
package-lock.json
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10890
package-lock.json
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17
package.json
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package.json
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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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BIN
public/favicon.ico
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BIN
public/favicon.ico
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Binary file not shown.
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public/index.html
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public/index.html
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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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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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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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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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public/manifest.json
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public/manifest.json
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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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src/APIRequest.css
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src/APIRequest.css
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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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src/APIRequest.js
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src/APIRequest.js
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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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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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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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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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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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src/App.css
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src/App.css
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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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h3 {
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margin: 2rem 0 1rem 0;
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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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src/App.js
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src/App.js
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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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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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src/App.test.js
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src/App.test.js
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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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src/Calculator.css
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src/Calculator.css
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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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src/Calculator.js
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src/Calculator.js
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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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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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src/Fauxbonacci.css
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src/Fauxbonacci.css
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.faux-component {
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font-size: 1.2rem;
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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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src/Fauxbonacci.js
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src/Fauxbonacci.js
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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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//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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//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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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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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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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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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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src/index.css
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src/index.css
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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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src/index.js
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src/index.js
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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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ReactDOM.render(<App />, document.getElementById('root'));
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registerServiceWorker();
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src/logo.svg
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src/logo.svg
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
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<g fill="#61DAFB">
|
||||
<path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
|
||||
<circle cx="420.9" cy="296.5" r="45.7"/>
|
||||
<path d="M520.5 78.1z"/>
|
||||
</g>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 2.6 KiB |
117
src/registerServiceWorker.js
Normal file
117
src/registerServiceWorker.js
Normal file
|
|
@ -0,0 +1,117 @@
|
|||
// In production, we register a service worker to serve assets from local cache.
|
||||
|
||||
// This lets the app load faster on subsequent visits in production, and gives
|
||||
// it offline capabilities. However, it also means that developers (and users)
|
||||
// will only see deployed updates on the "N+1" visit to a page, since previously
|
||||
// cached resources are updated in the background.
|
||||
|
||||
// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
|
||||
// This link also includes instructions on opting out of this behavior.
|
||||
|
||||
const isLocalhost = Boolean(
|
||||
window.location.hostname === 'localhost' ||
|
||||
// [::1] is the IPv6 localhost address.
|
||||
window.location.hostname === '[::1]' ||
|
||||
// 127.0.0.1/8 is considered localhost for IPv4.
|
||||
window.location.hostname.match(
|
||||
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
|
||||
)
|
||||
);
|
||||
|
||||
export default function register() {
|
||||
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
|
||||
// The URL constructor is available in all browsers that support SW.
|
||||
const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
|
||||
if (publicUrl.origin !== window.location.origin) {
|
||||
// Our service worker won't work if PUBLIC_URL is on a different origin
|
||||
// from what our page is served on. This might happen if a CDN is used to
|
||||
// serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
|
||||
return;
|
||||
}
|
||||
|
||||
window.addEventListener('load', () => {
|
||||
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.
|
||||
checkValidServiceWorker(swUrl);
|
||||
|
||||
// Add some additional logging to localhost, pointing developers to the
|
||||
// service worker/PWA documentation.
|
||||
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 {
|
||||
// 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 a new issue