i guess i should know this from java, but i always...

# getting-started

[Hullaballoonatic]

i guess i should know this from java, but i always just make sure by programming around the question, and figured I'd finally ask:

val data = aDataClassOrSomething(foo = ArrayList<Stuff>())
val bar = data.foo

is bar passed by reference or just value? If I alter bar does it alter data.foo?

[Shawn]

have you tried? lol

data class ADataClassOrSomething<T> (val foo: ArrayList<T>)
data class Stuff(val field: Any)

val data = ADataClassOrSomething(foo = ArrayList<Stuff>())
val bar = data.foo

data.foo.add(Stuff("foo"))
bar.add(Stuff("bar"))

println(data.foo)
println(bar)

[Hullaballoonatic]

sometimes, but i've given up on figure out edge cases, because it feels very inconsistent

[Shawn]

If you have an example of what you think might be an edge case/unintuitive, someone might be able to explain what’s happening

[Hullaballoonatic]

i run into this question so often, then give it 30 seconds of thought before deciding to just program around it once again because that's faster in this moment 😛

[Shawn]

shrung

[Alowaniak]

Afaik it's the same as in Java; always pass by value (which are references)