Introduction to Elm
What is elm?
- A pure statically typed functional language
- designed to declaratively describe web apps
- embeds a flavour of functional reactive programming in the language itself
Why do we care?
- Solves the JS problem
- Solves the cljs problem
- Really good type system and compiler
- No runtime exceptions (seriously)
- NO RUNTIME EXCEPTIONS
- Guarantees - no side effects, no mutation
Why do we care?
Why do we care?
How does it work?
S
S
S
S
Signals
S (Actions)
Combine
S (Model)
Foldp
View
Let's build a simple thing
Blue Clicks
Red Clicks
Green Clicks
Total Clicks
clickcounter.io
For a slightly more complicated thing ...
Introduction to Elm
By Julian Jelfs
