We all know global variables in JavaScript are bad.

If you declare a bunch of variables/functions in the global namespace they become properties of the global object, in the browser that would be the window object.

So the other day I was thinking of a way to find out how many of them were in a page. So I came up with this script that you can run to find out:

You can paste that in your console and a list of the globals will show up at the end of the page.

The names that start with @ mean they are properties inherited from the prototype chain.