Last week, I asked in my OS class how tickless operating systems use interrupts or other mechanisms to achieve lower power usage. I did not get my question answered, and have since read into the topic some more. Here is what I found.

Wait, what? You can do functional programming in PHP? Doesn't that make PHP even more messy? Why would you do such a thing? In this case, no, it makes my code cleaner.

By using the & (logical and) operator, we can easily (and quickly!) test whether an integer is a power of 2.