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(New page: <haskell> parent :: Sheep -> Maybe Sheep parent s = father s `mplus` mother s grandparent :: Sheep -> Maybe Sheep grandparent s = paternalGrandfather s `mplus` paternalGr...)
 
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Line 8: Line 8:
 
maternalGrandfather s `mplus`
 
maternalGrandfather s `mplus`
 
maternalGrandmother s
 
maternalGrandmother s
  +
</haskell>
  +
  +
Alternative grandparent:
  +
<haskell>
  +
grandparent :: Sheep -> Maybe Sheep
  +
grandparent s = parent s >>= parent
 
</haskell>
 
</haskell>

Revision as of 14:33, 21 September 2012

parent :: Sheep -> Maybe Sheep
parent s = father s `mplus` mother s
 
grandparent :: Sheep -> Maybe Sheep
grandparent s = paternalGrandfather s `mplus` 
                paternalGrandmother s `mplus` 
                maternalGrandfather s `mplus` 
                maternalGrandmother s

Alternative grandparent:

grandparent :: Sheep -> Maybe Sheep
grandparent s = parent s >>= parent