[bobbykjack]

If IE didn't barf on a trailing comma after the last value, we wouldn't have this problem. That's probably the biggest source of all my IE JavaScript bugs. To be fair, I'm not actually sure what the spec says, but the spec might be wrong :-)

[Joeri]

IE9 and above should handle it fine, so it's just a matter of time before this problem goes away. In the meantime there are two things you can do: use an editor which highlights this as an error (e.g. Webstorm), or add a pre-commit hook on your code repository which disallows committing code that doesn't pass jslint checks. We use both practices on a 200 kline js codebase, and it has essentially gotten rid of javascript errors at the customer due to bad syntax (as well as those tricky = / == / === issues).