I have a map containing keys that map to a list of stuff. I want to iterate all keys of that map and use all entries for each key (a list of stuff) to yield an object that I then collect into a big list of objects. How to I do that? Its

Map<Int, List<Stuff>> -> List<NewStuff>

where new stuff is yielded from each list of stuff

Is an

entry

every key for a map? In that case can’t you just do

map.flatMap { /*convert it into NewStuff */  }

yes,

Map

actual has a

.flatMap

that does what you want