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kotlinlang

hey guys.. what do you guys feel its the best way for a class to communicate to other with events? 
In Java Android I was used to a Listener interface of sorts that the listening class would implement. 
I am trying to make the jump to Kotlin but I have not found a way that I like better then that old one. Multiple lambda as callbacks don't look better and the IDE is not as clear when you are searching for who is listening to those events.