I'm good with this, consistency is always nice if there's no compelling reason to be inconsistent.

Yeah, but i fear we will forget about this convention pretty quicky, plus it's not standardized across all the projects

It's a little esoteric, but we could put this in the style guide. The corresponding text would be something like "strict ordered comparison" (this PR: index < 0, index > -1), "ordered comparison to zero" (index < 0, index >= 0), "equality comparison" (index === -1, index !== -1), etc. At a glance, globalize seems to use equality comparison and qunit is inconsistent. I'm not feeling ambitious enough to look at jquery-mobile or jquery-ui right now.

I just checked the git builds for each. The modes for Mobile are (index === -1, index > -1) and for UI are (index === -1, index !== -1), although each has a single "not present" index < 0 and both exhibit a few "present" variations (Mobile even has three !!~index patterns).

cc @arschmitz, @scottgonzalez

I feel like this is getting into the weeds, unless there's a strong reason to be extremely consistent.

With that being said, if a linter is going to find these, then I don't care what we do.

Im not strongly opinionated here either. If we are going to do something though i would like it to be in the style guide or as @markelog said it will quickly be forgotten and not enforced.

Closed by 6ae222a