Why aren't plus/minus operators defined on `Array<T>`?

# stdlib

[mg6maciej]

Why aren't plus/minus operators defined on Array<T>?

[ilya.gorbunov]

plus for arrays is right here https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/plus.html

[ilya.gorbunov]

And we do not provide Array.minus because it's required to know in advance the size of the result array to allocate.

[mg6maciej]

Ahh. Forgot Array is invariant. Was trying to plus Array<SubClass> + List<SuperClass>.

[mg6maciej]

Makes sense with minus. .toList() solves all the problems...

[benleggiero]

If order doesn't matter, Set might be better-suited

[mg6maciej]

Thanks. My lists are generally short, so I don't care too much about micro-optimizations for now. And don't get me started on how I found list - element != list - listOf(element) 😉

[voddan]

^^ good puzzler right there