Haskell笔记 (18)—— Polymorphic function和oveloaded function

Posted by nanxiao on 二月 15, 2016 in Haskell笔记 |

A function is called polymorphic (“of many forms”) if its type contains one or more type variables. E.g.: length :: [a] -> Int

A polymorphic function is called overloaded if its type contains one or more class constraints. E.g.: (+) :: Num a => a -> a -> a.




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