Why Scala's traits execute from right to left?

Question

For example, this:

val queue = new BasicIntQueue with Doubling with Incrementing with Filtering
queue.put(1)
println(queue.get())

will print:

Filtering
Incrementing
Doubling
put
4

As for me it would be more readable if it executed from left to right, in the order I wrote operations.

Answer 1

Because it follows the same pattern as inheritance. Imagine that you had something like this:

class BasicIntQueue 
class Doubling extends BasicIntQueue
class Incrementing extends Doubling
class Filtering extends Incrementing

val queue = new Filtering

You'll get the same results as you saw: Filtering gets executed first, then pass on to Incrementing, then Doubling and finally BasicIntQueue.