jshaver/react-interview-code
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Added first set of interview components.

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John Shaver 2018-04-02 15:03:32 -07:00
commit 1f67de5c3b
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# See https://help.github.com/ignore-files/ for more about ignoring files.
# dependencies
/node_modules
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

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{
"name": "react-interview-code",
"version": "0.1.0",
"private": true,
"dependencies": {
"bootstrap": "^4.0.0",
"react": "^16.3.0",
"react-dom": "^16.3.0",
"react-scripts": "1.1.1"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
}
}

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#000000">
<!--
manifest.json provides metadata used when your web app is added to the
homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
-->
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<!--
Notice the use of %PUBLIC_URL% in the tags above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<title>React App</title>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start` or `yarn start`.
To create a production bundle, use `npm run build` or `yarn build`.
-->
</body>
</html>

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{
"short_name": "React App",
"name": "Create React App Sample",
"icons": [
{
"src": "favicon.ico",
"sizes": "64x64 32x32 24x24 16x16",
"type": "image/x-icon"
}
],
"start_url": "./index.html",
"display": "standalone",
"theme_color": "#000000",
"background_color": "#ffffff"
}

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.comic-nav {
display: flex;
justify-content: space-between;
margin-bottom: 2rem;
}
.comic-image {
margin: 1.5rem auto;
max-width: 95%;
display: block;
}

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import React from 'react';
import './APIRequest.css';
export default class APIRequest extends React.Component {
constructor(props) {
super(props);
this.state = {
img: "",
maxNum: 0,
num: "",
alt: "",
title: "Loading Comic..."
};
}
componentDidMount() {
this.fetchComic().catch(e => {
console.error("Failed to fetch initial comic! : ", e);
});
}
updateComicFromAPI(data) {
this.setState(old => {
if(old.num !== "" && old.num !== data.num) return {};
return {
img: data.imgRetina ? data.imgRetina : data.img,
maxNum: data.num > old.maxNum ? data.num : old.maxNum,
num: data.num,
alt: data.alt,
title: data.title
};
});
}
fetchComic() {
return fetch(`https://xkcd.now.sh/${this.state.num}`).then(
response => response.json()
).then(x => this.updateComicFromAPI(x));
}
fetchNext() {
this.setState(old => ({num: ++old.num}), () => {
this.fetchComic().catch( err => {
console.error("Error fetching next comic: ", err);
});
});
}
fetchPrevious() {
this.setState(old => ({num: --old.num}), () => {
this.fetchComic().catch( err => {
console.error("Error fetching prev comic: ", err);
});
});
}
render() {
const s = this.state;
const prev = s.num > 0 ?
<button className="btn" onClick={() => this.fetchPrevious()}>Previous</button> :
"";
const next = s.num < s.maxNum ?
<button className="btn" onClick={() => this.fetchNext()}>Next</button> :
"";
return <section className="card mt-3 comic-component" >
<div className="card-body">
<p>This interviewer requested I write a component that makes an API
call and displays it. I did a bit more than that since it was more
fun and I think better deomnstrated my ability to make API calls.</p>
<div className="comic-nav">{prev}{next}</div>
<h5 className="card-title">{s.title}</h5>
{ s.img ? <img className="comic-image" src={s.img} title={s.alt} /> : "" }
<p>All comics from <a href="https://Xkcd.com">xkcd web comic</a></p>
</div>
</section>;
}
}

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.App-header {
background-color: #222;
text-align: center;
height: 80px;
padding: 20px;
color: white;
}
.App-title {
font-size: 1.5em;
}
h3 {
margin: 2rem 0 1rem 0;
}
.finished-components {
padding-bottom: 5rem;
}

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import React, { Component } from 'react';
import './App.css';
import '../node_modules/bootstrap/dist/css/bootstrap.min.css';
import Calculator from './Calculator.js';
import Fauxbonacci from './Fauxbonacci.js';
import APIRequest from './APIRequest.js';
class App extends Component {
render() {
return (
<div className="App container mt-3">
<header className="App-header">
<h1 className="App-title">Interview Problems</h1>
</header>
<div className="card"><div className="card-body">
<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>
</div></div>
<Calculator />
<Fauxbonacci />
<APIRequest />
</div>
);
}
}
export default App;

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import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
it('renders without crashing', () => {
const div = document.createElement('div');
ReactDOM.render(<App />, div);
ReactDOM.unmountComponentAtNode(div);
});

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.calc-number-input {
width: 4rem;
margin-right: 1rem;
text-align:center;
}
.calc-operator-input {
margin-right: 1rem;
}
.calc-answer {
margin-left: 1rem;
}

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import React from 'react';
import './Calculator.css';
export default class Calculator extends React.Component {
constructor(props) {
super(props);
this.state = {
a: "",
b: "",
operator: "ADD"
}
}
calcResult({a, operator, b}) {
a = parseFloat(a);
b = parseFloat(b);
if(isNaN(a) || isNaN(b) || !operator) {
return "";
}
switch(operator) {
case "ADD":
return a + b;
case "SUBTRACT":
return a - b;
case "MULTIPLY":
return a * b;
case "DIVIDE":
return a / b;
}
return "";
}
render() {
return <div className="card mt-3"><div className="card-body">
<p>This interviewer requested that I make a component that allowed a user
to input two numbers and select an operator and get a result.</p>
<input className="calc-number-input" onChange={e => this.setState({a: e.target.value})} />
<select className="calc-operator-input" onChange={e => this.setState({operator: e.target.value})}>
<option value="ADD">{String.fromCharCode(0x2B)}</option>
<option value="SUBTRACT">{String.fromCharCode(0x2D)}</option>
<option value="MULTIPLY">{String.fromCharCode(0xD7)}</option>
<option value="DIVIDE">{String.fromCharCode(0xF7)}</option>
</select>
<input className="calc-number-input" onChange={e => this.setState({b: e.target.value})} />
= <span className="calc-answer">{this.calcResult(this.state)}</span>
</div></div>;
}
}

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.faux-component {
font-size: 1.2rem;
}
.faux-component input {
margin: 0 0.4rem;
width: 3em;
text-align: center;
}

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import React from 'react';
import './Fauxbonacci.css';
export default class Fauxbonacci extends React.Component {
constructor(props) {
super(props);
this.state = {i: ""};
}
//pretty implementation but slooow.
prettyButSlowFindByIndex(i) {
i = parseInt(i);
if(isNaN(i) || i < 0) return "";
if(i === 0) return 7;
if(i === 1) return 5;
return this.findByIndex(i - 1) + this.findByIndex(i - 2);
}
//much faster, but without proper tail calls, it still explodes the
// callstack sometime before i == 10000 but by then the result isn't
// very accurate due to limitation of javascript Number.
fasterFindByIndex(i) {
if(i < 0 ) return "Range error...";
if(i === 0) return 7;
if(i === 1) return 5;
let answer = "Does not compute!";
try {
answer = this.findByIndexHelper(i);
} catch(e) {
console.error(e);
}
return answer;
}
findByIndexHelper(i, before = 5, beforeBefore = 7, runningIndex = 2) {
if(i === runningIndex) {
return before + beforeBefore;
}
return this.findByIndexHelper(i, before + beforeBefore, before, runningIndex + 1);
}
render() {
const safeI = parseInt(this.state.i);
const result = isNaN(safeI) ? "" : this.fasterFindByIndex(safeI);
const exact = !result || result < Number.MAX_SAFE_INTEGER;
return <div className="card mt-3"><div className="card-body faux-component">
<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>
<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}
</div></div>
}
}

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body {
margin: 0;
padding: 0;
font-family: sans-serif;
}

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import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
ReactDOM.render(<App />, document.getElementById('root'));
registerServiceWorker();

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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
<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"/>
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</svg>
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// 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();
});
}
}