What is the equivalent value for NSRange.location in a Range object in Swift 3?

Question

Can someone give me a hint which Range property is the equivalent property of the NSRange location property.

I'm especially interested in how I would wrap the next line of code from Swift 2.3 -> Swift 3.0

if myRange.location != NSNotFound { ... } 

myRange is still a Range property, so the compiler tells me correctly: A value of type Range does not have a member location

Is checking an empty property enough?

 if !myRange.isEmpty { ... } 

Thanks in advance