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

val L = List[String]() for (a <- 1 to 100) { L :+ a.toString }

Output of following code?

How to groupBy using multiple columns in Scala collections?

Choose correct output using the code?

Statement that is not correct for Scala's mutable.Map?

The map method on List (and Seq), transforms each element of a collection based on a function. For example, if we have a List[String] and want to convert it to all lowercase?

Best description for the variance expression as following?

Which one is false about Futures and Promises?

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

Given the type hierarchy defined below, Choose correct statement below?

Choose the expression that allows the code to compile