Created
March 6, 2014 18:08
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| phoneBook = | |
| [("betty","555-2938") | |
| ,("bonnie","452-2928") | |
| ,("patsy","493-2928") | |
| ,("lucille","205-2928") | |
| ,("wendy","939-8282") | |
| ,("penny","853-2492") | |
| ] | |
| getNumberByName :: (Eq a) => a -> [(a, c)] -> Maybe c | |
| getNumberByName name [] = Nothing | |
| getNumberByName name ((person, phone):list) = if name == person | |
| then Just phone | |
| else getNumberByName name list | |
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