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Editorial Team
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Asked: 2026-06-03T16:56:08+00:00

concatr ::Integer -> [[Integer]] -> [[Integer]] concatr x (y) = [x] : y concatr

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concatr ::Integer -> [[Integer]] -> [[Integer]]
concatr x (y)    = [x] : y
concatr x (y:ys) = concatr x y:  concatr x ys

I have tried so many combinations of this that my head is starting to hurt. What exactly am i doing wrong? I just want an integer to be put in every sublist of a list passed in.

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1 Answer

  1. Editorial Team

    You can use the map function.

    concatr :: Integer -> [[Integer]] -> [[Integer]]
concatr x ys = map (x:) ys

    Eta reduce for a terse solution:

    concatr x = map (x:)
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