map
inline fun <V, E, U> Result<V, E>.mapBoth(success: (V) -> U, failure: (E) -> U): U
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Maps this Result to U by applying either the success function if this Result is Ok, or the failure function if this Result is an Err. Both of these functions must return the same type (U).
Elm: Result.Extra.mapBoth
Haskell: Data.Either.either