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Introduction to React - Triangle.rb May 2015
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Nathan Hunzaker
May 12, 2015
Technology
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Introduction to React - Triangle.rb May 2015
The presentation I gave at Triangle.rb introducing React.
Nathan Hunzaker
May 12, 2015
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Transcript
React
Nate Hunzaker Front-end Developer, Viget @natehunzaker
We build lots of user interfaces
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Every framework has a big idea
They don't just reinvent the wheel
“Backbone.js gives structure to web applications [...]”
“Ember.js is built for productivity. Designed with developer ergonomics in
mind...”
Keep it simple
“We can only hope to make reliable those things in
which we understand.” - Rich Hickey
• Composition • One way data flow • Static mental
model
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
Encourage developers to break a user interface into small components.
<Blogs/> <Navigation/> <Posts/> <Post/> <Post/> <Post/> <Post/>
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• No templates • Strange syntax
“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 install babel npm install react-tools
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<main/> <Menu/> <Inbox/>
Virtual DOM
Build a DOM tree Compare to old state Get cheapest
mutation path (with Levenshtein) Write new DOM (in batches) New state
State changed! So what...
Imperative Programming Describe the transition between state
Declarative Programming Express the logic, not the flow
Define Interface Change State • Each change in state flushes
to the DOM • Properties are sent in one direction • No cascading updates
Let's talk about state
A component is given props A component manages state
A component is given props
A component manages state
That's kind of it
Static Rendering Model
This is fast
Holy Hot Modules! https://github.com/gaearon/react-hot-loader
Really fast
Static Mental Model
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.renderToStaticMarkup
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How do I build real apps with this?
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
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!
Flux Formal Capacitor: A demo isomorphic Flux app https://github.com/vigetlabs/capacitor
Flux Fun http://www.natehunzaker.com/yappy-bird/
App State Stimuli New state
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
On that note...
React injects a few constraints that yield powerful benefits
By focusing on composability and a single direction flow of
data, we can greatly simplify our apps
Hopefully you didn't ignore me after the JSX :)
Thanks! Nate Hunzaker Front-end Developer, Viget @natehunzaker
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
react-router: the best router https://github.com/rackt/react-router