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Hi

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It’s about functional programming

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I think the functional paradigm in general is what React has opened up to a wider audience.

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We see ourselves moving towards less side effects and a more declarative [style] in the future React.

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We need to start thinking about what goes beyond classes.

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class Counter extends React.Component { constructor(props) { super(props); this.state = {count: props.initialCount}; } tick() { this.setState({count: this.state.count + 1}); } render() { return (
Clicks: {this.state.count}
); } } Counter.propTypes = { initialCount: React.PropTypes.number }; Counter.defaultProps = { initialCount: 0 };

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Functional
 Programming UI = f(state)

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Reactive
 Programming Functional
 Programming UI = f(state) auto-render

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let FancyButton = { initialize(props) { }, render(props, state) { }, observe(props, state) { }, reduce(props, state, signals) { }, output(props, state, signals) { } };

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Cycle.js and functional reactive user interfaces @andrestaltz

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Novem ber 2014 v0.1.0 January 2015 v0.7.0
 Custom Elem ents v0.8.0
 No m ore string-based v0.12.0
 User as a function February 2015 April 2015 v0.20.0
 Injectable Stream s v0.21.0
 Just functions May 2015 v0.23.0
 Drivers June 2015 v1.0.0

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Lines of JS code

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Concise

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How do you mount an isomorphic Cycle.js app 
 client-side so it doesn't
 re-render in vain?

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Declarative

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Data Flow

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DOMSource decrement$ increment$ action$ count$ vtree$ DOMSink

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RxJS Observables!

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HARD to reason about

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19th century Easy to 
 reason about

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Hard to reason about

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No training…

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Horses go anywhere

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Cars: only on asphalt

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You can use
 horses if you wish

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Genghis Khan’s empire conquered a whole continent

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Yet, cars are better

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RxJS ?

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RxJS Observable

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clicks
 [, , ] increments
 [1, 1, 1] counter
 3 map reduce clicks
 [, , , ] increments
 [1, 1, 1] counter
 3

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clicks
 [, , ] increments
 [1, 1, 1] counter
 3

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clicks
 [, , ] increments
 [1, 1, 1] counter
 3 push() pushListener pushListener push(1) counter =
 increments.reduce(…) clicks
 [, , , ] increments
 [1, 1, 1, 1] counter
 4

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clicks
 , , , increments
 1, 1, 1, 1 counter
 4 var increments = clicks.map(c => 1); var counter = increments.scan(add); var clicks = Rx.Observable.fromEvent(‘click’);

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Everything is automatically updated

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Your
 main()
 function The DOM
 and
 the user Cycle.js framework User land

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Your
 main()
 function The DOM
 and
 the user An evolving tree of virtual DOM Cycle.js framework User land

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Your
 main()
 function The DOM
 and
 the user An evolving tree of virtual DOM Sequence of user events Cycle.js framework User land

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Components?

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Component ? ?

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Component Props ?

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Component Props VDOM

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Component Props VDOM ?

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Component Props VDOM User events

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Your
 main()
 function Sequence of
 user events An evolving tree 
 of virtual DOM

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Components ✅

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Architecture?

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Your
 main()
 function The DOM
 and
 the user

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 main()
 MVI Components
 Explicit data flow

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intent()
 model()
 view() MVI

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Listen
 Process
 Speak MVI

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Components intent()
 model()
 view()

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Explicit data flow decrement$ increment$ action$ count$ vtree$

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DOMSource decrement$

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Reactive
 Programming Functional
 Programming main() is pure RxJS everywhere cycle.js.org

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The future? Developer Experience (DX) Tools that make it easier to write code Code is more often read than written

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Thanks ;)