Saturday, December 10, 2016

October 2016 1Liner 1HaskellADay problem and solutions

  • October 21st, 2016:
    You have l1 :: [(v, [(k, x)])]
    You need the transformation l2 :: [(k, [(v, x)])]
    Redistribute v and k in one line
    Props for elegance
    • Francisco T @aiceou redist xs = fromListWith (++) $ concat $ (map f xs) where f (a,ys) = map (\(x,y) -> (x,[(a,y)])) ys ... but k has to be 'Ord'

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