I folks, testing this ```either<Error, List<...

# arrow

[thanerian]

I folks, testing this

either<Error, List<String>> {
  remote.findByTerm(term)
}.mapLeft { NetworkError }

does not catch the exception, mock is configured in this way using mockito-kotlin

given { runBlocking { remote.findByTerm(any()) } } willThrow { RuntimeException("BOOM!") }

if I use Either.catch{} the exception is captured correctly and not propagated, is that the intended behavior?

[kioba]

I read somewhere, but didn’t find it now. either block doesn’t catch exception and Either.catch has to be used for something like this. assuming either{} is equivalent of the for monadic comprehension in scala where you still have to catch an exception. so either{} is simply for the binding, Either.catch is for converting unpure functions to pure.

[kioba]

either{
val result = Either.catch{ Boom() }.bind()
}

did you bind the catch?

[thanerian]

I just call Either.catch instead of either block

[raulraja]

The Either block is parametric to E and when in suspended form exceptions are the continuation responsibility. What could be done is give catch the binding super powers of the either block

[raulraja]

Then Either.catch can bind either of Throwables and exit with them but disregard E, so not able to bind custom error models in the same block

[raulraja]

If anyone wants to work on a PR and need help I know what needs to be done. It's just adding either inside the catch block and letting the function receiver come through catch.

[thanerian]

a good #hacktoberfest PR 😂