Elm - The freedom of constraints

Transcript

1. Elm The freedom of constraints
2. Hi
4. Elm • Functional Programming language for the frontend • More than a language • Delightfully opinionated • Incredible community
5. Simple language • Minimal syntax • No magic • Small vocabulary • Very few concepts
6. - Evan Czaplicki What is the minimal thing we can get away with And how far can we go with that
7. Virtual DOM Event R U N T I M E Model update Msg HTML
8. R U N T I M E Model update Msg Sub Cmd • Listen on a web socket • Monitor the url (history API) • Incoming JS calls • … • Make an HTTP request • Change the url (history API) • Trigger outgoing JS calls • …
9. Union types type Result e a = Err e | Ok a
10. Union types type RemoteData e a = NotAsked | Loading | Failure e | Success a krisajenkins/remotedata
11. Records type alias Model = { firstName : String , lastName : String , sidebarVisible : Bool , moreStuff : ... } viewUser : Model -> Html Msg viewUser model =
12. Constraining records viewUser : { r | firstName : String , lastName : String } -> Html msg viewUser { firstName, lastName } = viewUser model =
13. Live dev server REPL Package manager Compiler Tooling
14. More! elm-test elm-verified-examples elm-html-test elm-format elm-benchmark elm-static-html elm-sketch-importer json-to-elm html-to-elm elm-webpack-loader
15. Constraints • Limit design space • Limit choices • Give guarantees
16. Community Slack - https://elmlang.herokuapp.com Reddit - /r/elm Mailing list Meetups! ❤ @zwilias