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Fluent Conf 2018: Building web apps with Elm Tutorial
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Jeremy Fairbank
June 12, 2018
Programming
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Fluent Conf 2018: Building web apps with Elm Tutorial
Jeremy Fairbank
June 12, 2018
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Transcript
Jeremy Fairbank @elpapapollo / jfairbank Building web apps with Elm
Visit README for demo and exercise URLs: bit.ly/fluent-elm-18
@testdouble helps improves how the world build software. testdouble.com/agency
bit.ly/programming-elm
Functional and statically typed programming language for frontend development elm
Web and UI Focused
Compiles to JavaScript
No runtime exceptions in practice.
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
Functional
Pure Data in Data out
Pure No side effects
Pure Predictable and Testable!
Immutable Data • Safety and consistency • Explicit flow of
data • No subtle mutation bugs
No undefined is not a function
Fast
One framework. No fatigue. Update View Model Messages
✓ Easier to write code ✓ Easier to write tests
✓ Easier to refactor
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
Format • Demos via ellie-app.com • Exercises via ellie-app.com •
Q&A
Coding Time! README for demo and exercise URLs: bit.ly/fluent-elm-18
Update View Model Messages The Elm Architecture
Application State Model
Model Virtual DOM View UI as a Function
elm Virtual DOM Todo List Learn Elm Build awesome Elm
apps Learn functional programming <html /> Model: Todo List
× Todo List Learn Elm Build awesome Elm apps Learn
functional programming User deletes first todo item <html /> Model: New Todo List
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 />
Messages Standardized application events
elm app model
elm app model Events Text Input Mouse Click Associate message
with event
elm app model Events Text Input Mouse Click When event
triggers (i.e. user clicks), deliver message
Update Model New Model Respond to messages and create new
state
model Update View
model Update View
model Update View VDOM
model Update View VDOM
model Update View Select red color
model Update View Select red color
model Update View Select red color
model Update View
model Update View
model Update View
model Update View VDOM
model Update View VDOM
Coding Time!
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
Thanks! Jeremy Fairbank @elpapapollo / jfairbank Slides: bit.ly/fluent-elm-slides-18 Repo: bit.ly/fluent-elm-18