# Hello World

To initiate a new React Native project you need to run: `react-native init <ProjectName>`. `react-native init` generates the following:

* `index.ios.js`
* `index.android.js`
* iOS (Xcode) project
* Android projects

For this workshop, **we have already done** `react-native-init` **for you and setup a skeleton project**. To get started:

```bash
$ git clone https://github.com/rangle/react-native-workshop.git
$ cd react-native-workshop
$ npm install
$ git checkout 1-hello-world
```

**Each section of the workshop is available in a separate git branch, so** `1-hello-world` **is the first one.** Let's open the project in a text editor to go through the generated code.

## Bootstrapping

In order to bootstrap a React Native app we use `AppRegistry` instead of `ReactDOM`, for example:

```javascript
import { AppRegistry, View, Text } from 'react-native';
import React, { Component } from 'react';

class Root extends Component {
  ...
}

AppRegistry.registerComponent('ApplicationName', () => Root);
```

## Run the App

* iOS

  ```bash
  $ react-native run-ios
  ```

  or Open `` `/Users/<userName>/reactNativeWorkshop/ios/reactNativeWorkshop.xcodeproj `` in Xcode
* Android

  ```bash
  $ react-native run-android
  ```

You should see something like this:

![hello world](https://2121106575-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LZp63Gm3O3A8Q8ddKvK%2F-LZp68a-SA_xLHt7vZ-w%2F-LZp6Adm9ZGYqfFwTO9J%2Fhello-world.png?generation=1551374276319970\&alt=media)