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# Enum – Enumeration Types

The last class we will look at here is the

`Enum`

class which supports operations on sequentially ordered types. We have already used this class in `[1..3]`

for creating a list of elements from `1`

to `3`

.class Enum a where

succ, pred :: a -> a

toEnum :: Int -> a

fromEnum :: a -> Int

enumFrom :: a -> [a] -- [n..]

enumFromThen :: a -> a -> [a] -- [n, n'..]

enumFromTo :: a -> a -> [a] -- [n..m]

enumFromThenTo :: a -> a -> a -> [a] -- [n, n'..m]

We do not have to worry about the implementation details of the Enum class at this point, but we can see that with an

`Enum`

class, we have access to the `[..]`

methods which can be very useful.Last modified 2yr ago