In general programmers are pretty smart people. Smart people sometimes like to show
off their smarts by demonstrating their mental juggling abilities. After all, if you can reliably
remember that r is the lower-cased version of the url with the host and scheme
removed, then you must clearly be very smart.
One difference between a smart programmer and a professional programmer is that
the professional understands that clarity is king. Professionals use their powers for good
and write code that others can understand.