I have not been able to find any explicitly stated documentation that addresses order preservation for the following case.
val map = mapOf(
"k2" to "v1",
"k1" to "v2",
"k3" to "v3"
)
val keys = map.keys.toList()
I would expect keys to always be in the following order:
["k2", "k1", "k3"]
Is it guaranteed that the order of keys be preserved in the same order they were initialized?
Yes, if you look at implementation of mapOf, it used LinkedHashMap which from Java docs says that it normally preservers key order, unless in case of re-inserting key.
But in case internal implementation might change for some reason I would rather suggest using linkedMapOf in same way as you did mapOf.
LinkedHashMap uses LinkedKeySet implementation when returning Set of keys which ensures correct order.