Swift override function in extension

Question

If I have a class:

class Spaceship {
    function prepareForLiftoff() throws {
        //Start the countdown!
    }
}

I ori

Answer 1

From the documentation:

Extensions can add new functionality to a type, but they cannot override existing functionality.

The documentation lists carefully and precisely what an extension is allowed to do.

As to your question:

Is there anyway to override a function of a particular class

Yes, it's called subclassing.