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What’s Redux Anyway?

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Giorgio Polvara

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Giorgio Polvara

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“React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the V in MVC.”

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The V in MVC

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¯\_(ϑ)_/¯

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Flux

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“Flux is the application architecture that Facebook uses for building client-side web applications. It complements React's composable view components by utilizing a unidirectional data flow. It's more of a pattern rather than a formal framework, and you can start using Flux immediately without a lot of new code.”

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+

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Alt

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Alt Reflux

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Alt Reflux Fluxible

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Alt Reflux Flummox Fluxible

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Alt Reflux Flummox Fluxible Fluxxor

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Alt Reflux Flummox Fluxible Fluxxor Fluxify

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Alt Reflux Flummox Fluxible Fluxxor Fynx Fluxify

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Alt Reflux Flummox Fluxible Fluxxor marty.js Fynx Fluxify

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Alt Reflux Flummox Fluxible Fluxxor marty.js Fynx Delorean Fluxify

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Alt Reflux Flummox Fluxible Fluxxor marty.js Fynx McFly Delorean Fluxify

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Dan Abramov

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MVC

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MVC

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author

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author name

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author name handler

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author name handler photo

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author name handler isFollowing photo

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author name handler text photo isFollowing

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author name handler text retweets photo isFollowing

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author name handler text retweets likes photo isFollowing

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author name handler text retweets likes photo likePhotos isFollowing

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author name handler text retweets likes timestamp photo likePhotos isFollowing

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author name handler text retweets likes timestamp photo likePhotos isFollowing

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author name handler text retweets likes timestamp { } photo likePhotos isFollowing

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{ … }

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State

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Store

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import { createStore } from 'redux' const store = createStore(...)

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store.getState() store.subscribe(function () { console.log(store.getState()) })

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Store

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State Store

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State Store

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State Store

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State Store

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State Store

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const Root = () => ( ) AppRegistry .registerComponent("App", () => Root)

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import { Provider } from 'react-redux/native' const Root = () => ( ) AppRegistry .registerComponent("App", () => Root)

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import { Provider } from 'react-redux/native' const Root = () => ( ) AppRegistry .registerComponent("App", () => Root)

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class App extends Component {} export default App

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import { connect } from 'react-redux'
 class App extends Component {} export default App

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import { connect } from 'react-redux'
 class App extends Component {} export default connect()(App)

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State Store

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State Store

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State Store

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State Store Action

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{ }

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{ type: '...' }

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{ type: 'LOGOUT' }

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{ type: '...', payload: ... }

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{ type: 'LIKE_TWEET', payload: tweetId }

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{ type: 'CREATE_TWEET', payload: text }

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{ type: 'ADD_POST', payload: { text: ..., author: ... tags: [...] } }

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{ type: 'LIKE_TWEET', payload: tweetId }

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function likeTweet (tweetId) { { type: 'LIKE_TWEET', payload: tweetId } }

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function likeTweet (tweetId) { return { type: 'LIKE_TWEET', payload: tweetId } }

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function likeTweet (tweetId) { return { type: 'LIKE_TWEET', payload: tweetId } } const action = likeTweet(1)

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State Store Action

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store.getState() store.subscribe(...)

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store.getState() store.subscribe(...) store.dispatch(action)

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State Store Action

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Reducers

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function(state, action) => nextState

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function(state, action) => nextState

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function(state, action) => nextState

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function(state, action) => nextState

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{ count: 85 }

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{ count: 85 } { type: 'INCREMENT' } { type: 'DECREMENT' }

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const reducer = (state, action) => { switch(action.type) { case 'INCREMENT': return {total: state.total + 1 } case 'DECREMENT': return {total: state.total - 1 } default: return state } }

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const reducer = (state, action) => { switch(action.type) { case 'INCREMENT': return {total: state.total + 1 } case 'DECREMENT': return {total: state.total - 1 } default: return state } }

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const reducer = (state, action) => { switch(action.type) { case 'INCREMENT': return { count: state.count + 1 } case 'DECREMENT': return {total: state.total - 1 } default: return state } }

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const reducer = (state, action) => { switch(action.type) { case 'INCREMENT': return { count: state.count + 1 } case 'DECREMENT': return { count: state.count - 1 } default: return state } }

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const reducer = (state, action) => { switch(action.type) { case 'INCREMENT': return { count: state.count + 1 } case 'DECREMENT': return { count: state.count - 1 } default: return state } }

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import { createStore } from 'redux' const store = createStore(...)

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import { createStore } from 'redux' const store = createStore(reducer)

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State Store Action

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State Store Action

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State Store Action

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State Store Action

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State Store Action

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State Store Action

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State Store Action

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State State Store Action

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State State Store Action

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State State Store Action

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State State Store Action

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State State Store Action Unidirectional Data Cycle

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Demo Time!

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State Store Action

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Where to go from here?

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Where to go from here? Create small Redux apps

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Where to go from here? Create small Redux apps Check combineReducers

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Where to go from here? Create small Redux apps Async actions with thunks Check combineReducers

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Where to go from here? Create small Redux apps Check combineReducers Async actions with thunks …

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Thank You Giorgio Polvara @gpx