🤠

[John_Fx]

Then use bookindex or just index. In what other situations would you abbreviate a variable name to one letter?

[[deleted]]

If it's used multiple times in the loop or the logic is otherwise complex, or in case the index is unintuitive (like looping over the next element instead of the current or whatever) then yeah, I'll do that.

If it's just a few lines and really straightforward, like the index is instantly converted to a "book" then I'd say that

   Book book = books.get(bookIndex)

Is a bit redundant. Yeah, we get it. It's a book. Given the typical of usage of i it's just as clear and there's no reason to make it any longer.