What specifies custom infix operator?

Which of following statements about functions is wrong?

In the below text, what type of return does the function ‘area’ give? Class Square: NamedShape { var sideLength: Double func area() -> Double { return sideLength*sideLength } }

In the below text, what is the class name? Class Square: NamedShape { var sideLength: Double func area() -> Double { return sideLength*sideLength } }

In the below text, what is the name of the class’s only method? Class Square: NamedShape { var sideLength: Double func area() -> Double { return sideLength*sideLength } }

What aspect of iOS development requires the use of NSOperation and/or Grand Central Dispatch (GCD)?

In which data types can you define methods?

Swift allows you to write semicolons at the end of statement.

If C is a superset of D, then D is a subset of C

Which is true about the Dictionary?

Extension can be used to create a new nested type of the following: