Mapper to convert network data into domain model and viceversa.

Mapper.kt

interface Mapper<D, M> {
    fun toModel(data: D): M
    fun toData(model: M): D
}

object ModelMapper : Mapper<Data, Model> {

    override fun toModel(data: Data): Model = with(data) {
        Model(...)
    }

    override fun toData(model: Model): Data = with(model) {
        Data(...)
    }
}

fun <D, M> Result<D>.toResultModel(mapper: Mapper<D, M>): Result<M> = when (this) {
    is Result.Success<D> -> Result.Success(mapper.toModel(this.value))
    is Result.Error<D> -> Result.Error(this.exception)
}