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Editorial Team
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Asked: 2026-05-30T19:09:59+00:00

I am reading this monad tutorial . I am trying to implement Sheep that

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I am reading this monad tutorial. I am trying to implement Sheep that will work with this tutorial.

I tried this 

-- No Sheep or Name, Father Sheep, Mother Sheep
data Sheep = Nothing | String Sheep Sheep

but it isn’t working.

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1 Answer

  1. Editorial Team

    The first part of a constructor definition is the name of the constructor. The types of its arguments come after that. Also if a constructor has no argument, the name isn’t followed by anything, so no “Nothing”. So if we were to name your constructors “NoSheep” and “Sheep”, it would be:

    data Sheep = NoSheep | Sheep String Sheep Sheep
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