Comment by inejge

> You must belong to the club of folks who use hashmaps to store 100 objects.

Apparently I belong to the same club -- when I'm writing AWK scripts. (Arrays are hashmaps in a trenchcoat there.) Using hashmaps is not necessarily an indictment you apparently think it is, if the access pattern fits the problem and other constraints are not in play.

> It's amazing how much we've brainwashed folks to focus on algorithms and lose sight of how to actually properly optimize code. Being aware of how your code interacts with cache is incredibly important.

By the time you start worrying about cache locality you have left general algorithmic concerns far behind. Yes, it's important to recognize the problem, but for most programs, most of the time, that kind of problem simply doesn't appear.

It also doesn't pay to be dogmatic about rules, which is probably the core of your complaint, although unstated. You need to know them, and then you need to know when to break them.