Introduction to React - Triangle.rb May 2015

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React

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Nate Hunzaker Front-end Developer, Viget @natehunzaker

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We build lots of user interfaces

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Every framework has a big idea

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They don't just reinvent the wheel

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“Backbone.js gives structure to web applications [...]”

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“Ember.js is built for productivity. Designed with developer ergonomics in mind...”

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Keep it simple

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“We can only hope to make reliable those things in which we understand.” - Rich Hickey

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• Composition • One way data ﬂow • Static mental model

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Compo(sition,nents) "React is all about building reusable components. In fact, with React the only thing you do is build components." - facebook.github.io/react

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Encourage developers to break a user interface into small components.

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• No templates • Strange syntax

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“Templates separate technology, not concerns.” - Pete Hunt (formerly of Facebook)

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JSX “The purpose of this specification is to define a concise and familiar syntax for defining tree structures with attributes.” http://facebook.github.io/jsx/

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How does this work?

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npm install babel npm install react-tools

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Virtual DOM

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Build a DOM tree Compare to old state Get cheapest mutation path (with Levenshtein) Write new DOM (in batches) New state

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State changed! So what...

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Imperative Programming Describe the transition between state

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Declarative Programming Express the logic, not the ﬂow

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Deﬁne Interface Change State • Each change in state flushes to the DOM • Properties are sent in one direction • No cascading updates

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Let's talk about state

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A component is given props A component manages state

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A component is given props

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A component manages state

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That's kind of it

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Static Rendering Model

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This is fast

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Holy Hot Modules! https://github.com/gaearon/react-hot-loader

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Really fast

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Static Mental Model

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When you render to a virtual environment, the DOM becomes an implementation detail

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What is an isomorphic?

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React.render() is idempotent Same in, same out

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React.renderToStaticMarkup

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How do I build real apps with this?

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Flux “Flux [...] complements React's composable view components by utilizing a unidirectional data ﬂow.” http://facebook.github.io/ﬂux/

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I thought you said this was simple

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Job Queue State State State I want to create a widget Ready a widget! I can totally do that! Ch-ch-ch-ch- changes I love David Bowie!

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Flux Formal Capacitor: A demo isomorphic Flux app https://github.com/vigetlabs/capacitor

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Flux Fun http://www.natehunzaker.com/yappy-bird/

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App State Stimuli New state

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Initial State Sound Jump()

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NuclearJS https://github.com/optimizely/nuclear-js Yahoo Flux https://github.com/yahoo/flux-examples Om (Clojurescript) https://github.com/swannodette/om

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On that note...

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React injects a few constraints that yield powerful beneﬁts

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By focusing on composability and a single direction ﬂow of data, we can greatly simplify our apps

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Hopefully you didn't ignore me after the JSX :)

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Thanks! Nate Hunzaker Front-end Developer, Viget @natehunzaker

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Iconography: User interface icon by Aziz, the Noun Project http://thenounproject.com/azisher JavaScript Logo: https://github.com/voodootikigod/logo.js General React Concepts: React Homepage http://facebook.github.io/react/ JSX Speciﬁcation http://facebook.github.io/jsx/ Rethinking Best Practices, Pete Hunt: https://www.youtube.com/watch?v=x7cQ3mrcKaY Decomplexifying Code with React, Steven Luscher: https://www.youtube.com/watch?v=rI0GQc__0SM An Introduction to ReactJS, James Pierce https://www.youtube.com/watch?v=m2fuO2wl_3c Flux Flux Homepage http://facebook.github.io/flux/ Examples React Fun https://github.com/nhunzaker/react-fun React Animatable https://github.com/nhunzaker/react- animatable An Isomorphic Chart https://github.com/nhunzaker/an- isomorphic-chart Capacitor https://github.com/vigetlabs/capacitor Yappy Bird https://github.com/nhunzaker/yappy-bird

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react-router: the best router https://github.com/rackt/react-router