Is there any way to extend an object?

Question

In scala, we cannot extend object:

object X  object Y extends X 

gives an error error: not found: type X

In my case someone has defined some functionality in an object and I need to extend it (basically add another method). What would be the easiest way to extend this object?

Answer 1

As so often the correct answer depends on the actual business requirement. Extending from an object would in some sense defy the purpose of that object since it wouldn't be a singleton any longer.

What might be a solution is to extract the behavior into an abstract trait. And create objects extending that trait like so:

trait T{     // some behavior goes here }  object X extends T  object Y extends T {     // additional stuff here }