Equivalent of Python's Pass in Scala

pass is a syntactic quirk of Python. There are some cases where the grammar requires you to write a statement, but sometimes you don't want a statement there. That's what pass is for: it's a statement that does nothing.

Scala never requires you to write a statement, therefore the way to not write a statement is simply to not write a statement.

I think () is similar.

scala> def f() = ()
f: ()Unit

scala> f              

scala>

As i understand in python pass is used for not yet implemented cases. If you need such thing in scala then use ??? it's similar to (), but is a function returning Nothing (def ??? : Nothing = throw new NotImplementedError) . Your code will compile, but if you call such a method it will crash with NotImplementedError

def foo: ResultType = ???