Check string for nil & empty

Question

Is there a way to check strings for nil and \"\" in Swift? In Rails, I can use blank() to check.

I currently have this, but i

Answer 1

var str: String? = nil

if str?.isEmpty ?? true {
    print("str is nil or empty")
}

str = ""

if str?.isEmpty ?? true {
    print("str is nil or empty")
}