Fay is a compiler for a proper subset of Haskell that type-checks using GHC and compiles to JavaScript. It supports pure functional programming, a Fay-specific monad, FFI, optional tail-call optimization, and integration with Cabal packages. GHC-compatible type checking, ensuring correctness. Lazy, pure functional semantics with a distinct Fay monad. Foreign Function Interface (FFI) to integrate native JS code. Compatible with standard Haskell packaging tools like Cabal.

Features

  • Compiles a Haskell subset to JavaScript
  • GHC-compatible type checking, ensuring correctness
  • Lazy, pure functional semantics with a distinct Fay monad
  • Foreign Function Interface (FFI) to integrate native JS code
  • Experimental tail-call optimization support
  • Compatible with standard Haskell packaging tools like Cabal

Project Samples

Project Activity

See All Activity >

Categories

Compilers

License

BSD License

Follow Fay

Fay Web Site

Other Useful Business Software
Our Free Plans just got better! | Auth0 Icon
Our Free Plans just got better! | Auth0

With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
Try free now
Rate This Project
Login To Rate This Project

User Reviews

Be the first to post a review of Fay!

Additional Project Details

Operating Systems

Linux, Mac, Windows

Programming Language

Haskell

Related Categories

Haskell Compilers

Registered

2025-09-04