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Yes, in repl it's convenient. I don't mind single letter block var names if the block spans one line :)

`ii` it is then

sigh, I once encountered a PFY junior who named all variables some variation on `nx`, so `n1`, `n2`, `n99` because they 'were all just numbers'.

Using `i`, `j`, and `k` as index variables is not bad practice.

Well, my attempt at a humorous aside didn't land.

To be strictly serious we are talking about block parameters in ruby which contain the values yielded to it which, in an enumeration, is likely to be a value object from a collection and only occasionally an index (where you've explicitly chained `#with_index` for e.g.). If you are nesting deep enough in ruby to call for `k` then, yes, it would be bad practice.

I would quit if I had to write multi-character index variables.