What are the pros of using traits over abstract classes?

Question

Can someone please explain traits in Scala? What are the advantages of traits over extending an abstract class?

Answer 1

This is the best example I've seen

Scala in practice: Composing Traits – Lego style: http://gleichmann.wordpress.com/2009/10/21/scala-in-practice-composing-traits-lego-style/

    class Shuttle extends Spacecraft with ControlCabin with PulseEngine{

        val maxPulse = 10

        def increaseSpeed = speedUp
    }