[Haskell-cafe] powerSet = filterM (const [True,
False]) ... is this obfuscated haskell?
tphyahoo at gmail.com
Fri Jul 17 05:35:21 EDT 2009
on haskell reddit today
powerSet = filterM (const [True, False])
is said to be beautiful / mind blowing. I just don't get it. I can
play with transformations until I get
powerSet  = []
powerSet (x:xs) =
let pxs = powerSet xs
in map (x:) pxs ++ pxs
which is understandable to me, but no matter how long I look at the
original filterM definition it just doesn't click.
Is this a uniquely haskell obfu, or is there a way of reading this
definition that makes sense?
If anybody agrees with me, care to throw out other examples of
"obfuscated haskell considered harmful"?
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