Declare a global variable in scala

Question

Is it possible to declare a global variable in this way?

if i run this snippet, i will encounter an error

object Test {
  val value -> error on this line for declaration issue
  def run() {
    value  = ... 
  }
def main(args: Array[String]) {
    run()
  }

thanks in advance.

Answer 1

You could in theory do it using a Trait. I'm not sure this is what you need though.

It would look like this:

trait MyTestTrait {
  val value: String
}

object MyTest extends MyTestTrait {
  val value = "yo!"
  def run = println(value)
}

Answer 2

No, that's not possible. You should do this:

object Test {
  val value = ...
}

Since your run() function does not take parameters, the contents of value can also be computed without it.