Is there a way to remove a Trait from an instance in Scala?

Question

I would like to know if having an instance to which a trait has been added to in runtime, it is possible to remove the trait off the instance, so it can behave as originally.

Answer 1

Traits are combined with classes at compile-time. So it is not possible to add/remove traits at run-time.

For your particular case, consider adding a method to your class:

class Foo(val a: Object, val b: Object, ...) {
  def original() = new Foo(a, b, ...)
}

Then you can call instance.original() to get back a copy of your object that is not affected by any traits.