Is there Multimap in Kotlin?

Question

I need to store values in map likie this:

 val map = HashMap<String, Set<String>>() 

But it is hard to interact with Set inside the map.

Is there any multimap implementations in Kotlin like Multimap in Google Guava?

Answer 1

No, there currently isn't. And there probably won't be one in the future.

Reference: https://discuss.kotlinlang.org/t/the-standard-library-and-a-kotlin-manifesto/1303/6

Alternative:

org.springframework.util.MultiValueMap org.apache.commons.collections4.MultiMap com.google.common.collect.Multimap 

To play with the Set in your example, you can:

map["key"].forEach(::println) 

Or something else.