alt Hacker NewsSorry, but I did not "forg[e]t a comma after the last item". I intentionally did not put a comma there. The list of the "important numbers" in my example is already complete and perfect, and is not supposed to ever change. I wanted to emphasise this fact by specifically omitting the comma there, in the hope that intelligent people in the future would get this message exactly as I intended for it to be.
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The trailing comma rule is to avoid errors when devs copy/paste a line or dump a new line at the end. This matters particularly for arrays in languages with implicit string concatenation, where the missing comma won't trigger a compile error.
You will find that pretty much every rule we have in any possible context will have some exceptions that are justified under some conditions.
Taking that as a reason to not have those rules in the first place seems like a logical fallacy that intelligent people should not make.
Must be nice to write code with the hopes that only intelligent people will read it.
I think all of us have worked on code that other people thought was perfect or will never change. Personally I love this rule because it saves me from looking at one extra commit (adding the comma when the next value gets added) when I'm trying dig through line history.