I have a map containing keys that map to a list of stuff. I want to iterate all keys of that map and...

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[frellan]

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

[Andreas Sinz]

map.entries.map { /*convert it.value into List<NewStuff> */ }.flatMap { it }

[frellan]

Is an entry every key for a map? In that case can’t you just do map.flatMap { /*convert it into NewStuff */ }

[Andreas Sinz]

yes, Map actual has a .flatMap that does what you want