scala> (2)
res0: Int = 2

scala> (2 + 2)
res1: Int = 4

scala> ((2 + 2))
res2: Int = 4

scala>   ((2 + 2))
res3: Int = 4

scala>   (  (2 + 2))
res4: Int = 4

scala>   (  (2 + 2 )  )
res5: Int = 4

scala> 5 ;   (  (2 + 2 )  ) ; ((5))
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       5 ;   (  (2 + 2 )  ) ;;
       ^
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       5 ;   (  (2 + 2 )  ) ;;
                   ^
res6: Int = 5

scala> (((2 + 2)), ((2 + 2)))
res7: (Int, Int) = (4,4)

scala> (((2 + 2)), ((2 + 2)), 2)
res8: (Int, Int, Int) = (4,4,2)

scala> (((((2 + 2)), ((2 + 2)), 2).productIterator ++ Iterator(3)).mkString)
res9: String = 4423

scala> 

scala> 55 ; ((2 + 2)) ; (1, 2, 3)
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       55 ; ((2 + 2)) ;;
       ^
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       55 ; ((2 + 2)) ;;
                ^
res10: (Int, Int, Int) = (1,2,3)

scala> 55 ; (x: Int) => x + 1 ; () => ((5))
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       55 ; (x: Int) => x + 1 ;;
       ^
res11: () => Int = <function0>

scala> 

scala> () => 5
res12: () => Int = <function0>

scala> 55 ; () => 5
<console>:11: warning: a pure expression does nothing in statement position; multiline expressions may require enclosing parentheses
       55 ;;
       ^
res13: () => Int = <function0>

scala> () => { class X ; new X }
res14: () => AnyRef = <function0>

scala> 

scala> def foo(x: Int)(y: Int)(z: Int) = x+y+z
foo: (x: Int)(y: Int)(z: Int)Int

scala> foo(5)(10)(15)+foo(5)(10)(15)
res15: Int = 60

scala> 

scala> List(1) ++ List('a')
res16: List[AnyVal] = List(1, a)

scala> :quit