[leephillips]

You should never write loops that way, at least in code you're going to share (assuming that you’re going to have some arr[i] in the loop body—if not, you would just do "for e in arr").

Assuming that arrays start at 1 is a source of occasional bugs in public packages. The existence of OffsetArrays means that arrays can start at any index (so for people who get nauseated by 1-based arrays, you can change it).

Instead, write "for i in eachindex(arr)".

In fact, Julia’s array syntax means you can loop over and manipulate arrays without using indexes much of the time, so don’t even need to know how they’re based.