macron questions

macron answers

• Cloud Haskell - How to write "pure" for Closures?
• cabal test does not print executable output
• lazy version of mapM
• Why does fold left expect (a -> b -> a) instead of (b -> a -> a)?
• When to expose constructors of a data type when designing data structures?
• What's with the 'in' keyword?
• Constructing efficient monad instances on `Set` (and other containers with constraints) using the continuation monad
• Int vs Word in common use?