how do I increment an integer variable I passed into a function in Scala?

Question

I declared a variable outside the function like this:

var s: Int = 0

passed it such as this:

def function(s: Int):         


        

Answer 1

If you just want to increment a variable starting with 3

val nextId = { var i = 3; () => { i += 1; i } }

then invoke it:

nextId()