Python Pass equivalent in Scala

Question

If there is a function you don’t want to do anything with, try doing something like this in Python:

def f(): pass 

My question is: is there something similar to pass in Scala?

Answer 1

pass is the syntax quirk of Python. There are some cases where the grammar requires you to write an instruction, but sometimes you do not need an instruction. Why pass : is an operator that does nothing.

Scala never requires you to write instructions, so the way to not write instructions is simply not to write instructions.

Answer 2

I think () is similar.

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

Answer 3

Typically, you can replace Unit with pass . You do nothing, and the line evaluates to Unit , like Java void , but itself explicit.

 // implicit return value of type Unit def showMsg(msg:Option[String]) = msg match { case None => Unit case Some(m) => println(m) } 

Answer 4

As I understand it, python pass used for cases not yet implemented. If you need such a thing in scala, then use ??? it is similar to () , but is a single instance of Nothing. Your code will be compiled, but if you call such a method, it will work with NotImplementedError

 def foo: ResultType = ???