The quirky functional language Haskell is surprisingly popular for 'weekend' projects, but it won't gain traction at work without a patron ...

PureScript is a strongly, statically typed language which compiles to JavaScript. It is written in and inspired by Haskell and aims at "allowing to write very expressive code which is still clear ...

Frege, named after the German mathematician Gottlob Frege, is a purely functional, strongly typed language for the JVM that is so similar to Haskell that “most idiomatic Haskell code will run ...

These same basic characteristics are what made Haskell so attractive to Facebook. The company needed a language that could help engineers write “rules” for identifying spam on its social network.

Haskell is a 25-year-old programming language that isn't all that popular. But Facebook uses it, and that's a sign of things to come.

Why is Haskell considered such a great language, yet is not being used? This question was originally answered on Quora by David Jeske.

The functional language Haskell has type classes, but Lux is intended to be less constraining. Getting around any constraints can be done natively to the language, not via hacks in the type system.