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December 10, 2015 06:08
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| data Identity a = Identity a deriving Show | |
| instance Monad Identity where | |
| return = Identity | |
| (Identity a) >>= f = f a | |
| m1 = Identity 3 | |
| addThree x = return $ x+3 | |
| bindExample1 = m1 >>= addThree | |
| m2 = Identity "salami" | |
| getLength x = return $ length x | |
| bindExample2 = m2 >>= getLength |
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