frugalfrank

Aside from that one, everything else was very clear and helpful. I've read about closures a few times, but don't think I really got it until finishing your exercises. Thanks!

I finished it yesterday, got stuck for a while in the Asynchonous Callbacks exercise. It wasn't completely clear to me what you wanted.

I went back today and saw that you changed the exercise and description.

"Define a function named doStuffAsync that takes one argument callback, that reads the contents of the file "passwords", appends "OWNED" and writes the results to file "world.txt", then calls callback. Remember, read doesn't return the file contents directly."

From the description shown above, It wasn't clear that you wanted world.txt to contain the content of 'passwords' plus 'OWNED' appended.

If more privacy-conscious users start using TrueCrypt after the revelations made (Dropbox being able to decrypt your data) in their latest blog post, http://news.ycombinator.com/item?id=2470074 , that conversion rate will need to be higher.

It's possible that the credit card companies might get affected by this if somehow these NFC technology communicate directly with the banks, akin to the debit system. But that's an unlikely scenario, credit cards and their reward system gives incentive to people to use their credit cards.