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

Which predicate tests whether x is object identical to y?

Which of these are NOT ways in which case classes differ from standard classes?

Which statement about the Option[+A] class is false?

Which of the following descriptions of case classes is *NOT* correct:

def g(): Int = try { 1 } finally { 2 } Calling g() results in

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?

Which one is not valid in Scala?

When Extractor object is using the match statement, the unapply method will be __ executed.

Which one is equivalent to the code below?

Which are types of function in Scala?