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

master
John Shaver 1 year ago
commit
1f67de5c3b
20 changed files with 13819 additions and 0 deletions
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  1. 21
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      .gitignore
  2. 2434
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      README.md
  3. 10890
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      package-lock.json
  4. 17
    0
      package.json
  5. BIN
      public/favicon.ico
  6. 40
    0
      public/index.html
  7. 15
    0
      public/manifest.json
  8. 10
    0
      src/APIRequest.css
  9. 77
    0
      src/APIRequest.js
  10. 19
    0
      src/App.css
  11. 26
    0
      src/App.js
  12. 9
    0
      src/App.test.js
  13. 12
    0
      src/Calculator.css
  14. 48
    0
      src/Calculator.js
  15. 9
    0
      src/Fauxbonacci.css
  16. 55
    0
      src/Fauxbonacci.js
  17. 5
    0
      src/index.css
  18. 8
    0
      src/index.js
  19. 7
    0
      src/logo.svg
  20. 117
    0
      src/registerServiceWorker.js

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.gitignore View File 

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+# See https://help.github.com/ignore-files/ for more about ignoring files.
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+
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+# dependencies
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+/node_modules
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+
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+# testing
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+/coverage
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+
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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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package-lock.json
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+ 17
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package.json View File 

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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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public/favicon.ico View File


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public/index.html View File 

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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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public/manifest.json View File 

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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 View File 

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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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+}

+ 77
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src/APIRequest.js View File 

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+import React from 'react';
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+import './APIRequest.css';
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+
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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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+
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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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+

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src/App.css View File 

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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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+
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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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+}

+ 26
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src/App.js View File 

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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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+
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+export default App;

+ 9
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src/App.test.js View File 

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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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+
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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 View File 

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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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+

+ 48
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src/Calculator.js View File 

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+import React from 'react';
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+import './Calculator.css';
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+
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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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+
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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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src/Fauxbonacci.css View File 

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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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+}

+ 55
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src/Fauxbonacci.js View File 

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+import React from 'react';
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+import './Fauxbonacci.css';
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+
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+export default class Fauxbonacci extends React.Component {
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+
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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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src/index.css View File 

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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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+}

+ 8
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src/index.js View File 

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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();

+ 7
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src/logo.svg View File 

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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">
3 
+        <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"/>
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+        <circle cx="420.9" cy="296.5" r="45.7"/>
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+        <path d="M520.5 78.1z"/>
6 
+    </g>
7 
+</svg>

+ 117
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src/registerServiceWorker.js View File 

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1 
+// In production, we register a service worker to serve assets from local cache.
2 
+
3 
+// This lets the app load faster on subsequent visits in production, and gives
4 
+// it offline capabilities. However, it also means that developers (and users)
5 
+// will only see deployed updates on the "N+1" visit to a page, since previously
6 
+// cached resources are updated in the background.
7 
+
8 
+// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
9 
+// This link also includes instructions on opting out of this behavior.
10 
+
11 
+const isLocalhost = Boolean(
12 
+  window.location.hostname === 'localhost' ||
13 
+    // [::1] is the IPv6 localhost address.
14 
+    window.location.hostname === '[::1]' ||
15 
+    // 127.0.0.1/8 is considered localhost for IPv4.
16 
+    window.location.hostname.match(
17 
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
18 
+    )
19 
+);
20 
+
21 
+export default function register() {
22 
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
23 
+    // The URL constructor is available in all browsers that support SW.
24 
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location);
25 
+    if (publicUrl.origin !== window.location.origin) {
26 
+      // Our service worker won't work if PUBLIC_URL is on a different origin
27 
+      // from what our page is served on. This might happen if a CDN is used to
28 
+      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
29 
+      return;
30 
+    }
31 
+
32 
+    window.addEventListener('load', () => {
33 
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
34 
+
35 
+      if (isLocalhost) {
36 
+        // This is running on localhost. Lets check if a service worker still exists or not.
37 
+        checkValidServiceWorker(swUrl);
38 
+
39 
+        // Add some additional logging to localhost, pointing developers to the
40 
+        // service worker/PWA documentation.
41 
+        navigator.serviceWorker.ready.then(() => {
42 
+          console.log(
43 
+            'This web app is being served cache-first by a service ' +
44 
+              'worker. To learn more, visit https://goo.gl/SC7cgQ'
45 
+          );
46 
+        });
47 
+      } else {
48 
+        // Is not local host. Just register service worker
49 
+        registerValidSW(swUrl);
50 
+      }
51 
+    });
52 
+  }
53 
+}
54 
+
55 
+function registerValidSW(swUrl) {
56 
+  navigator.serviceWorker
57 
+    .register(swUrl)
58 
+    .then(registration => {
59 
+      registration.onupdatefound = () => {
60 
+        const installingWorker = registration.installing;
61 
+        installingWorker.onstatechange = () => {
62 
+          if (installingWorker.state === 'installed') {
63 
+            if (navigator.serviceWorker.controller) {
64 
+              // At this point, the old content will have been purged and
65 
+              // the fresh content will have been added to the cache.
66 
+              // It's the perfect time to display a "New content is
67 
+              // available; please refresh." message in your web app.
68 
+              console.log('New content is available; please refresh.');
69 
+            } else {
70 
+              // At this point, everything has been precached.
71 
+              // It's the perfect time to display a
72 
+              // "Content is cached for offline use." message.
73 
+              console.log('Content is cached for offline use.');
74 
+            }
75 
+          }
76 
+        };
77 
+      };
78 
+    })
79 
+    .catch(error => {
80 
+      console.error('Error during service worker registration:', error);
81 
+    });
82 
+}
83 
+
84 
+function checkValidServiceWorker(swUrl) {
85 
+  // Check if the service worker can be found. If it can't reload the page.
86 
+  fetch(swUrl)
87 
+    .then(response => {
88 
+      // Ensure service worker exists, and that we really are getting a JS file.
89 
+      if (
90 
+        response.status === 404 ||
91 
+        response.headers.get('content-type').indexOf('javascript') === -1
92 
+      ) {
93 
+        // No service worker found. Probably a different app. Reload the page.
94 
+        navigator.serviceWorker.ready.then(registration => {
95 
+          registration.unregister().then(() => {
96 
+            window.location.reload();
97 
+          });
98 
+        });
99 
+      } else {
100 
+        // Service worker found. Proceed as normal.
101 
+        registerValidSW(swUrl);
102 
+      }
103 
+    })
104 
+    .catch(() => {
105 
+      console.log(
106 
+        'No internet connection found. App is running in offline mode.'
107 
+      );
108 
+    });
109 
+}
110 
+
111 
+export function unregister() {
112 
+  if ('serviceWorker' in navigator) {
113 
+    navigator.serviceWorker.ready.then(registration => {
114 
+      registration.unregister();
115 
+    });
116 
+  }
117 
+}

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