JavaScript Doesn't Support Allman Style

Oh my gosh! The following doesn't do what you'd think it does:
You can try it out in http://jsfiddle.net/.

It gets [undefined] in the last two alert statements.

I got this surprising snippet^[1] from this blog I follow.

(Granted, the title of my blog might be a bit strong.)

References

[1] Brace styles and JavaScript

http://www.2ality.com/2013/01/brace-styles.html