Difference between revisions of "Solution2.html"
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(Another definition of grandparent.) |
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| Line 13: | Line 13: | ||
<haskell> |
<haskell> |
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grandparent :: Sheep -> Maybe Sheep |
grandparent :: Sheep -> Maybe Sheep |
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| − | grandparent s |
+ | grandparent s = parent s >>= parent |
</haskell> |
</haskell> |
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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