Which is considered best practice in zig?

Hi, so I recently got into zig (and systems programming as a whole) about 3 months ago and let’s just say I don’t know enough to know what’s considered best practice. So let’s say you have a generic data structure… Something like an ArrayList and you want to write a function that performs an operation on two ArrayList, let’s say like an addition operation of sorts that adds the elements of two ArrayList and produces a new one, which implementation would be considered best practice; fn add(comp...