Checking if variable is set in global scope?

Question

Is there any way to check if a JavaScript variable has been set in the global scope in your code? Here's the use case:

var pizza;

pizza.isGlobalScoped()

Is there some method/conditional or any other way to figure out if a variable is not block scoped or within a closure?

Answer 1

In the browser you can do

If ( "pizza" in window)...