(Difference between revisions)
Revision as of 13:38, 7 August 2011
I am a newbie, interested in Haskell.
I like this:
primes = 2 : g (fix g) -- double staged production idea due to M. O'Neill where g xs = 3 : (gaps 5 $ foldi (\(q:qs) -> (q:) . union qs) [[p*p, p*p+2*p..] | p <- xs]) gaps k s@(x:xs) | k < x = k : gaps (k+2) s -- | k<=x = minus [k,k+2..] xs | True = gaps (k+2) xs -- inlined to avoid a space leak fix g = xs where xs = g xs -- global defn to avoid space leak