How to solve such as scenario with arrow? ```fun P...

# arrow

[zero_coding]

How to solve such as scenario with arrow?

fun Program.handleRead(id: String?): UserMapper =
    id?.let {
        UUID.fromString(it)?.let { uuid ->
            queries.read(uuid)?.toMapper()
        } ?: throw UUIDWrongFormatException()
    } ?: throw UserNotFoundException()

[Youssef Shoaib [MOD]]

Try the Either monad maybe?

[zero_coding]

But it will be to strict

[zero_coding]

tagless final

[zero_coding]

would be nice.

[pakoito]

MonadError than

[pakoito]

ApplicativeError even

[isto]

I used custom error types (instead of exceptions) when it makes sense together with Either and IO (https://github.com/istonikula/realworld-api), I also tried tagless final approach (https://github.com/istonikula/realworld-api/pull/27)

[zero_coding]

Thanks guys