Swift: init let variable based on a boolean

I use Swift 3 and I want to init a String let variable based on a boolean. I know how to do it with a standard if statement with a var variable but not as a one line expression.

With Java i would do:

String str = myBool ? "John" : "Peter";

Is there a equivalent​ with Swift 3 to not use a var and in a one-line way?