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README Convert Natural Negative NonZero Odd Positive Prime Whole

Even

Because the constructor for Even is not exported, you can be confident that if you are using a Even, then its Even.

type Even = Even Int
fromInt : Int -> Maybe Even
toInt : Even -> Int
module Even exposing (Even, fromInt, toInt)

{-|
Because the constructor for `Even` is not exported, you can be
confident that if you are using a `Even`, then its `Even`.

@docs Even, fromInt, toInt
-}


{-| -}
type Even
    = Even Int


{-| -}
fromInt : Int -> Maybe Even
fromInt x =
    if x % 2 == 0 then
        Just (Even x)
    else
        Nothing


{-| -}
toInt : Even -> Int
toInt (Even x) =
    x