JavaScript can do lots of things; make desktop apps, run web servers, build world-class enterprise applications, make freakin' full-fledged games, ...
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It says on your profile that you are a learning web developer. I really like that you understand scopes but this is generally not a place where passwords are stored, especially not super important government ones. ;)
Oh, I completely understand! I was just using a pretty simple and impractical example to demonstrate the concept of scopes. I do not condone enclosing top-secret API keys, passwords, and other sorts of confidential information within the scope of an exposed program ;)
One day, maybe not today, maybe not tomorrow, this will become a normal thing as we move away from backends, or rather we smash the notion of servers. Clients will rule. That is my strange prediction.
That would be so weird but awesome at the same time. Write a blog post when it happens!
Well? Where's Godzilla?!