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Fluent Conf 2018: Building web apps with Elm Tu...

Fluent Conf 2018: Building web apps with Elm Tutorial

Jeremy Fairbank

June 12, 2018
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  1. Jeremy Fairbank @elpapapollo / jfairbank Building web apps with Elm

    Visit README for demo and exercise URLs: bit.ly/fluent-elm-18
  2. The 2nd argument to function `add` is causing a mismatch.

    7| add 2 "3" ^^^ Function `add` is expecting the 2nd argument to be: Int But it is: String Compile time static type checks
  3. Content • Functions and expressions • Static applications • Dynamic

    applications with the Elm Architecture • Working with Lists • Static Types and Type Aliases • Input Events and Union Types
  4. elm Virtual DOM Todo List Learn Elm Build awesome Elm

    apps Learn functional programming <html /> Model: Todo List
  5. × Todo List Learn Elm Build awesome Elm apps Learn

    functional programming User deletes first todo item <html /> Model: New Todo List
  6. Todo List Learn Elm Build awesome Elm apps Learn functional

    programming View Model: New Todo List Elm notices missing todo item in virtual DOM list, so it just removes the corresponding <li> instead of fully rendering. elm Virtual DOM ×<html />
  7. elm app model Events Text Input Mouse Click When event

    triggers (i.e. user clicks), deliver message
  8. Resources • bit.ly/programming-elm • elm-lang.org • elm-lang.org/examples • guide.elm-lang.org •

    www.elm-tutorial.org • builtwithelm.co • Slack • elmlang.herokuapp.com