Question

val flag = false

if (val data = flag) {
  println(data)
}

Is it possible to assign the flag inside a if statement and get evaluated automatically in Scala?

Answer 1

Yes but it doesn’t escape the scope so you cannot use it in body of the if

if ({val data = true; data}) 
  println("data was true")

The assignment doesn’t return a value but you can return it instead. Better to do something like

def test(data: Boolean) {
  if (data) {/* data in scope */} 
  else      {/* data in scope */}}