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Functional Principles React Rally, 23 August 2015 in @jessitron React! Elm and

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@jessitron Not a Front-End Dev

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Facebook @adamjernst http://www.infoq.com/presentations/fp-facebook- mobile-apps

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Functional Programming the technique

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Functional Programming { { } } the technique

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Functional Programming { { } } } { the technique

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Functional Programming { { } } } { the technique

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Functional Programming { { } } } { the technique

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Functional Programming { { } } } { the technique

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Functional Programming the philosophy

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Functional Programming the philosophy Declarative Style Composition Flow of Data Isolation

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Declarative Style Composition Flow of Data Isolation

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React Flux Elm pattern libraries typed, functional language library pattern

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{ } <> act 1 minute of Re

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{ } <> act 1 minute of Re

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act 1 minute of Re

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C mposition o

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image text C mposition o

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image text ad C mposition o

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image text ad C mposition o

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image text ad

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image text ad

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image text ad

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image propTypes = { width: React.PropTypes.number, img: CustomPropTypes.url.isRequired, link: CustomPropTypes.url }

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image type alias Model = { width: Maybe Int, img: Url, link: Maybe Url } Elm

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code compile *.elm elm.js run Elm

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undefined

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Declarative Style say what we want let the robots make it so

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props state virtual DOM

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props state virtual DOM In, Out Data Data

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In, Out Data Data

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access outside state change the world modify its input Never Never Never In, Out Data Data

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doesn't matter how many times it's called same result every time In, Out Data Data

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Isolation

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Isolation

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Isolation

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options.unshift("")

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Immutable Data

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Immutable

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Immutable In, Out Data Data

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Tie our hands To free our minds Immutable In, Out Data Data

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"Re C About asoning ode"

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"Re C About asoning ode" Predicting what it will do in all situations not just this one I'm debugging or this one example test.

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componentDidMount componentWillReceiveProps componentDidUpdate

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1 minute of lux F

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low of ata F D

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Html Model Action Elm

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Html Model Action Effects

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update view init

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update view init

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update view init Model Action

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update view init Model Action type alias Model = { recentEvents : List Event, highlight : Maybe EventActor }

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update view init Model Action init: Model init = { recentEvents = [], highlight = Nothing }

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update view init Model Action update action model = case action of SingleEvent event -> { model | recentEvents <- event : } PersonOfInterest actor -> { model | highlight <- Just actor }

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update view init

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update view init view addr model = Html.div [ ] [ Header.view model.repo, RepoInput.view, EventTicker.view addr mode SeeThePeople.view addr mod ]

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update view init ? main

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update view init componentDidMount componentWillReceiveProps componentDidUpdate

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elm-lang.org Evan Czaplicki

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elm-lang.org Evan Czaplicki

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Declarative Style Composition Flow of Data Isolation

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when in act propTypes immutable data Flux, or better: Redux all service calls in one place re

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@jessitron https://github.com/jessitron/elm-sydron