Delete playground.js

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import React, { Component } from 'react';
import { View, SectionList, Text, Button } from 'react-native';
export default class HomeScreen extends Component {
constructor(props) {
super(props);
this.state = {
bgColor: '#cb2600',
};
}
clickMe = () => {
if (this.state.bgColor === '#a8139f') {
this.setState({ bgColor: '#cb2600' });
} else {
this.setState({ bgColor: '#a8139f' });
}
};
render() {
return (
<View style={{ backgroundColor: this.state.bgColor }}>
<Text style={{ color: '#fff' }}>Hello</Text>
<Text style={{ color: '#22ff31' }}>World</Text>
<Button title="Change to pink" onPress={this.clickMe} />
</View>
);
}
}
const sampleData = {
somePostId1: {
title: 'today now',
timestamp: Date.now(),
startOfDay: 1502838000,
},
somePostId3: {
title: 'today but older',
timestamp: Date.now() - 10000000,
startOfDay: 1502838000,
},
somePostId4: {
title: 'today but even older',
timestamp: Date.now() - 60000000,
startOfDay: 1502838000,
},
somePostId2: {
title: 'hello yesterday',
timestamp: Date.now() - 82000000, // minus 23 hours - just to make it yesterday ;p
startOfDay: 1502751600, // yesterday ;p
},
somePostId5: {
title: 'hello yesterday but older',
timestamp: Date.now() - 82800000, // minus 23 hours - just to make it yesterday ;p
startOfDay: 1502751600, // yesterday ;p
},
};
// export default class PostsScreen extends Component {
// constructor(props) {
// super(props);
// this.ref = null;
// this.state = {
// postSections: [],
// };
// }
//
// componentDidMount() {
// // this.ref = firebase.database().ref('posts');
// // this.ref.on('value', this._onPostsUpdate);
// // just fake it to test
// this._onPostsUpdate({
// val() {
// return sampleData;
// },
// });
// }
//
// componentWillUnmount() {
// // always unsubscribe from realtime events when component unmounts
// // if (this.ref) {
// // this.ref.off('value', this._onPostsUpdate);
// // }
// }
//
// _onPostsUpdate(snapshot) {
// const value = snapshot.val() || {};
// const keys = Object.keys(value);
// const sections = {};
//
// // we'll group them now by date
// for (let i = 0, len = keys.length; i < len; i++) {
// const key = keys[i];
// const post = value[key];
//
// // assuming post will have a 'timestamp' field and a `startOfDay` field
// // start of day can be calculated as above `startOfToday`
//
// if (!sections[post.startOfDay]) {
// sections[post.startOfDay] = {
// title: 'Header - I will leave this up to you', // todo today/yesterday/3 days ago etc
// // will use this later to sort the sections so today is on top
// key: post.startOfDay,
// data: [],
// };
// }
//
// const data = Object.assign({ key }, post);
// // add a post to a specific section date
// // we'll push/unshift depending on the date, so they' appear in order
// if (!sections[post.startOfDay].data.length) {
// // array is empty so nothing to compare sort, just push it
// sections[post.startOfDay].data.push(data);
// } else {
// const previousTimestamp = sections[post.startOfDay].data[sections[post.startOfDay].data.length - 1].timestamp;
// if (previousTimestamp < data.timestamp) sections[post.startOfDay].data.unshift(data);
// else sections[post.startOfDay].data.push(data);
// }
// }
//
// this.setState({
// postSections: Object.values(sections).sort((a, b) => a.key > b.key).reverse(),
// });
// }
//
// _renderSectionItem = ({ item }) => {
// // todo your custom section item component
// // return (
// // <EventCell
// // userName={item.userName}
// // postTitle={item.postTitle}
// // />
// // );
//
// return <Text>{`${item.title} - ${item.timestamp}`}</Text>;
// };
//
// _renderSectionHeader = ({ section }) => {
// // todo your custom section header
// return (
// <Text style={{ backgroundColor: '#000', color: '#fff' }}>{section.title}</Text>
// );
// };
//
// render() {
// return (
// <SectionList
// sections={this.state.postSections}
// renderItem={this._renderSectionItem}
// renderSectionHeader={this._renderSectionHeader}
// />
// );
// }
// }