Re: [Haskell-cafe] powerSet = filterM (const [True, False]) ... is this obfuscated haskell?

Thomas Hartman wrote:

on haskell reddit today powerSet = filterM (const [True, False])

is said to be beautiful / mind blowing. Is this a uniquely haskell obfu, or is there a way of reading this definition that makes sense?

To me, these are more obvious: powerSet = map catMaybes . mapM ((mzero:).return.return) powerSet = map concat . mapM ((mzero:).return.return) They work by pretty much the same principle. Perhaps they seem simpler to me only because I use mapM a lot more than I use filterM. Regards, Yitz