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Merge pull request #2 from ReactBangalore/exercise/performance-optimization
Exercise: Performance optimisation
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‎exercise/.gitignore‎

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# dependencies #
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#############
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/node_modules
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# testing #
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#############
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/coverage
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# production #
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#############
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**/build
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# misc #
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#############
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.DS_Store
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.env
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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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#ESLint config #
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#############
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.eslintrc.json
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# IDE files #
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#############
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nbproject
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.~lock.*
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.buildpath
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.idea
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.project
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.settings
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composer.lock
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.history/
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.vscode/

‎exercise/package.json‎

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{
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"name": "react-advanced-workshop",
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"version": "1.0.0",
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"description": "",
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"keywords": [],
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"main": "src/index.js",
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"dependencies": {
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"react": "16.2.0",
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"react-dom": "16.2.0",
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"react-scripts": "1.1.0"
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},
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"devDependencies": {},
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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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}

‎exercise/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>

‎exercise/src/Counter.js‎

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import React, { Component, Fragment } from "react";
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import superExpensiveFunction from "./utils/superExpensiveFunction";
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class Counter extends Component {
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static buttonStyle = {
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padding: "5px"
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};
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state = {
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count: 0,
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timestamp: Date.now()
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};
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increment = prevState => ({
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count: prevState.count + 1
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});
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handleCounterClick = () => {
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this.setState(this.increment);
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};
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handleDummyOperationClick = () => {
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this.setState({
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timestamp: Date.now()
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});
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};
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shouldComponentUpdate(nextProps, nextState) {
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// Implement shouldComponentUpdate to avoid unnecessary re-renders.
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}
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render() {
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const { count } = this.state;
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const calculatedCount = superExpensiveFunction(count);
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return (
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<Fragment>
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<div>Clicks: {calculatedCount}</div>
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<div style={Counter.buttonStyle}>
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<button onClick={this.handleCounterClick}>Increment</button>
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</div>
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<div style={Counter.buttonStyle}>
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<button onClick={this.handleDummyOperationClick}>Dummy</button>
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</div>
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</Fragment>
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);
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}
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}
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export default Counter;

‎exercise/src/Hello.js‎

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import React from 'react';
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export default ({ name }) => <h1>Hello {name}!</h1>;

‎exercise/src/index.js‎

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import React from "react";
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import { render } from "react-dom";
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import Counter from "./Counter";
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const styles = {
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fontFamily: "sans-serif",
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textAlign: "center"
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};
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const App = () => (
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<div style={styles}>
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<Counter />
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</div>
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);
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render(<App />, document.getElementById("root"));

‎exercise/src/utils/superExpensiveFunction.js‎

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const superExpensiveFunction = input => {
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console.log("superExpensiveFunction");
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return input;
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};
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export default superExpensiveFunction;

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