Let's make the result of division by 0 42 so that it's defined as well...

I like this better. You just forgot the '=' in '>='

I like this solution, but it seems hardly worth the effort of writing a function. Nice work!

That just creates a string that repeats string n times. Nothing more to it.

A more Swift name would be:

func repeat(string: String, times count: Int) -> String

or you could use a method on String

extension String {
    func repeated(times count: Int) -> String { // implement }
}

So you are saying, dont name variables, that are within a def, important names that have other uses? Example dont create a variable named Str, Int, Float etc

These functions are against Swift naming conventions. func repeatStr(_ string: String, _ n: Int) -> String. Global functions, the term Str, blank external labels and n as an internal label are all against Swift naming guidelines.