Sorry another newb question. I've have several fun...

# arrow

[tim]

Sorry another newb question. I've have several functions that are called serially and only return a concrete value if they fail ... i've tried representing them as Option<Failure> but I'm unsure how to construct the comprehension on None. Is there an easy way to do this, or should I be using Either? If Either, what type should I use on the Right (Unit?)?

[Bob Glamm]

huh that's a long .getOrElse chain

[Bob Glamm]

val result = optA.getOrElse(optB).getOrElse(optC).orElse("no failures"), +/- some type matching

[Bob Glamm]

There wouldn't be a comprehension on None

[tim]

👍 I had tried applicative.mapN, but I can now see that only fires when all inputs are Some/Right

[tim]

I'll give the getOrElse chain a try 🙏

[Bob Glamm]

Full disclosure, I may have that method name wrong. 🙂

[Bob Glamm]

Usually it's something like 'getOrElse', but I can't remember for sure what it is on Option in Kotlin

[tim]

thats cool i'll take a look shortly and should be able to figure it out from tehre

[pakoito]

if you user Either it'll be easier because of the swap method

[tim]

okay i'll give both a try and see what seems most coherent

[Bob Glamm]

ahh yeah, Either comprehension will stop on first failure then swap and maybe toOption

[Bob Glamm]

See, it's a good thing @pakoito knows what he's talking about

[pakoito]

we had this issue on JS and Hack (PHP) where you couldn't build comprehensions for the null case

[pakoito]

so you end up with awkward statements to make them work

[pakoito]

in Kotlin the :? works, right?

[pakoito]

it's ?let and :?

[Bob Glamm]

Fore sure ?.let. I think ?: as well but I'm less sure of that

[Bob Glamm]

I lose track between Scala Groovy Kotlin and Java

[Bob Glamm]

If I delved into Clojure at least I wouldn't have trouble with remembering operators, just matching parens (((())))

[pakoito]

billions and billions and billions of parens

[pakoito]

❤️

[pakoito]

(-> forms) for the extra pain haahah

[Bob Glamm]

ugh that is SO wrong

[Bob Glamm]

TBH my biggest pain point is remembering the lambda syntax between the big 4

[Bob Glamm]

I usually fumble around in the IDE until the red squiggles disappear

[Bob Glamm]

and the type hints appear