elm.md

Elm - programming language

Pros

• No runtime errors - that's huge!
• Easy refactoring - basically because compiler will catch all errors (except the logical ones)
• Need for less tests - a lot of stuff is covered with types and a features of ML langauge
• Everything is explicit
  • No surprise where this comes from
  • but alos requires passing stuff around and adds lines of code
• Immutable
• elm-format - automatic formatting of the code
• "compiler driven development"

Cons

• One leader to follow

Resources

• https://guide.elm-lang.org/
• http://elmprogramming.com
• https://www.elm-tutorial.org
• https://orasund.gitbook.io/elm-cookbook/

Unanswered questions

• How to do Drag&Drop
• How to Localize app

Dev tips

• Patterns for default values
• Performant Elm

Working with Maybe

• Actively try to model your data structures to avoid Maybe
• Separate code that checks for presence from code that calculates values
• Business functions may return Maybe, but may not accept Maybe as any of it's arguments