Modal FRP for all: Functional reactive programming without space leaks in Haskel...
summary
A modal FRP language Ratus is implemented as a Haskell library plus a GHC plugin that enforces stricter typing: a later modality for time-shifted values and a box modality for stable (always-available) data. The compiler runs a multi-tick → single-tick transform, desugars to a strict core, and proves causality, absence of space leaks and productivity via a Lambda-tick core formalized in Coq. Ships with an FRP library and a Pong example; installable with cabal.
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chapters (16)
- 0:00Intro
- 0:42Modal FRP
- 1:50Streams
- 3:34Model types
- 5:15Shallow embedding
- 7:23Ratus
- 8:40How Rus looks like
- 9:44How it works
- 12:47Memory leaks
- 15:44Stable types
- 18:24Pong game
- 19:34Implementation
- 22:52Met Theory
- 23:40Operations semantics
- 25:09Other resources
- 26:38Conclusion
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