What is the are differences between -> and => ?
In the declaration of a function?
foobar :: Integer -> Integer -> [Integer]
What is the are differences between -> and => ? In the declaration of
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What is the are differences between -> and => ?
In the declaration of a function?
foobar :: Integer -> Integer -> [Integer]
->is for function takes. The signaturex -> ymeans “a function that takes anxand returns ay“.=>is for dealing with classes. It can appear only once per type signature. The stuff to the left of it is a “context”, listing which types must be instances of what classes. The stuff on the right is a normal type signature.For example,
(Num x, Show y) => x -> y -> Stringwould indicate thatxhas to be a number type andyhas to be a displayable type.