I was a bit disappointed when the focus is not related to cryptography. I.e. a poorly written comparison function compares multiple expressions and the use of

I was a bit disappointed when the focus is not related to cryptography. I.e. a poorly written comparison function compares multiple expressions and the use of && short-circuit the logic, result in a timing attack. Would love to read an article about this topic, i.e. how to write a function whose execution time is constant regardless of the inputs, and thus not leak any side-channel information to the attacker.