HelloWorld.js

import React, {Component} from 'react';
import {StyleSheet, Text, View } from 'react-native';
// ES6 or ES2015
export default class Hello extends Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>Hello</Text>
            </View>
        );
    }
}


var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});