[ithcy2]

Yes, the variable definitions page leaves me scratching my head. Not sure what it's doing under performance. Surely that's a matter of your personal coding style and I'm not sure a jQuery tutorial site should be so dogmatic about how you choose to define your variables when there's negligible performance impact either way. Although JSLint loves to complain about the "old & busted" style, grouping variable definitions together with commas goes against the principle that inserting a new line of code anywhere should be "safe". If you paste in a new variable definition statement with a semicolon in the midst of a group of comma-separated lines, you're going to break things.

The bit on "clever conditionals" is rubbish as well. Not only are the "better" ways much slower, they're much harder to read. I opened an issue for this one: https://github.com/jquery/learn.jquery.com/issues/258