What will the following function return: def foo(o:Any) = { o match { case Option(x) => "hi!" case anything => anything } } When passed a 'None' object?

`() => Unit` is best described as

What would be returned by the following function: def foo(l:List[Int]) = { var x=l.head; l.collect{ case a:Int if a>x => x=a; a }; x } When passed: List(2,4,6,8,6,3,1)

What is a lazy var?

Are parenthesis `(` and curly braces `{` interchangeable?

Which predicate tests whether x is object identical to y?

Choose the correct statement that describes an 'abstract sealed' class?

Scala is ................ with Java. The two languages are interoperable with each other.

Correct statements that describe a Scala Case class?

Which one describes using Scala class that is defined in a package object from Java?

Often a module is too large to fit comfortably into a single file. When that happens, you can use traits to split a module into separate files. Which one is described by the above statement?