For the type heirachy defined below, Choose the most correct statement below for the output?

trait A{ def a = 1 } trait X extends A{ override def a = { println("X") super.a } } trait Y extends A{ override def a = { println("Y") super.a } } For the expression val xy = new AnyRef with X with Y xy.a

Which one is false about Futures and Promises?

Best description for the variance expression as following?

In Scala everything is an Object, No ___?

Option that best describes the difference between a var and val definition in Scala?

Which one is Web Frameworks of Scala?

How to groupBy using multiple columns in Scala collections?

Output of following code?

For the code below, Choose the correct statement that describes an issue with the code?

Choose output of given code below?

Choose output of the given code?