react native

let's talk

let's talk

mobile apps

not

mobile web app

aka "responsive"

not

hybrid app

aka "webview"

not

progressive web app

AKA "pwa"

let's talk

native mobile apps

heaven

* Platform apis

* platform ui/ux

* PERFORMANCE

glamour

hell

* learning curve

* SINGLE PLATFORM

* "SLOW"  DEVELOPMENT

* "HARD"  TO DEBUG

Learn once,

write anywhere

https://facebook.github.io/react-native

LEANDRO NUNES

software ENGINEER @

TWITTER | GITHUB | hackerrank @LNFNUNES

Build

using

and

native mobile apps

JavaScript

React

who's using ?

https://facebook.github.io/react-native/showcase.html​

rn reasons why

* learning curve

ios

android

objective-c

java

objective-c / swift

java / kotlin

Javascript

one language

to rule them all

import React, { Component } from 'react'
import { AppRegistry, View, Text, StyleSheet } from 'react-native'

class HelloWorldApp extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text>Hello World</Text>
      </View>
    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
})

AppRegistry.registerComponent('App', () => HelloWorldApp)

Reactjsx (ES7)

React native "hello world"

components "html'

<div> <View>
<span> / <p> <Text>
<input type="text"> <InputText>
<a> / <button> <Button>
<img> <Image> 
render() {
  return (
    <View>
      <Text>Hello World</Text>
    </View>
  )
}

Styling "css" 

render() {
  return (
    <View style={styles.container}>
      <Text style={{color: 'black'}}>Hello World</Text>
    </View>
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
})

* STYLESHEET MODULE OR  INLINE STYLES

*"css like"  name/value

* Layout Flexbox

// 1. Platform
Install Xcode // Android SDK
brew install node
brew install watchman

// 2. React Native CLI
npm install -g react-native-cli

// 3. Creating and Running
react-native init AwesomeProject
cd AwesomeProject
react-native run-ios // run-android

Setup

https://facebook.github.io/react-native/docs/getting-started.html

* single platform

ios

android

#teamios

#teamandroid

almost

no code reuse

very

expensive

nearly

shared skills

Universal js WEb team

android  /  ios          

more than 85% shared code

platform specific code 

import { Platform, StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  height: (Platform.OS === 'ios') ? 200 : 100,
});
// ...
const styles = StyleSheet.create({
  container: {
    flex: 1,
    ...Platform.select({
      ios: { backgroundColor: 'red' },
      android: { backgroundColor: 'blue' },
    }),
  },
});

https://facebook.github.io/react-native/docs/platform-specific-code.html#platform-module

By Platform module

platform specific code 

// |- BigButton.ios.js
// |- BigButton.android.js

const BigButton = require('./BigButton');

// React Native will automatically pick up
// the right file based on the running platform.

https://facebook.github.io/react-native/docs/platform-specific-code.html#platform-specific-extensions

By file extention

* "slow" development

ios

android

build the app

build the same  app

each change

manually re-compile entire  app

common js development

live-reload / hot-reload

* "hard" debug

ios

android

platform specific

TOOLING

consistant js tooling

custom js debugger / chrome devtools

in-app errors warnings

 

performance overlay 

app store

process

approval

7 - 14 days

~

Updates

1 - 3 days

~

cherry on the cake

ota

over-the-air deployment

Microsoft

http://codepush.tools

wallmartlabs

http://electrode.io

more about wallmart's ota  https://adtmag.com/articles/2016/11/01/react-native-ota.aspx

apphub

https://deploy.apphub.io

Where to go ?

* https://facebook.github.io/react-native

* http://www.reactnativeexpress.com/view

* http://www.reactnative.com

* http://www.awesome-react-native.com

* https://js.coach/react-native

* https://snack.expo.io

* https://microsoft.github.io/reactxp

thank you !   @lnfnunes

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