exercise-1.md

##Exercise 1: Edit the HelloWorld component

1. Open the project in your text editor and edit app/components/HelloWorld.js.

export default class HelloWorld extends Component {
  render() {
    return (
      <div>Hello World!</div>
    )
  }
}

In the render method, you'll find what looks like HTML. It's actually JSX; a JavaScript syntax extension that makes the actual code for creating elements look more familiar.

// Plain ol' JavaScript
React.createElement('a', { href: '/login', title: 'Login' }, 'Log in to your account');

// JSX
<a href='/login' title='Login'>Log in to your account</a>

1. Change "Hello World!" to something else and save. The webpage should now have your changes.

Note: You shouldn't have to reload your webpage. We're hot-loading here, so you you'll see your changes as you make them. https://www.quora.com/Whats-hot-loading-in-Webpack-and-how-does-it-work

###[Next Step: Create a simple `Toggle` component →](./exercise-2.md)