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He probably left the function empty to keep it simple. And with "perfectly valid code" he's probably referring to not having any syntax error's, which is true.

I believe the issue is that the code gets parsed as a function expression that is being indexed by a series of strings in comma expressions. This happens instead of automatic semicolon insertion jumping in and then giving you the "expected" code.

As a brief aside, TypeScript could help catch this sort of thing with its `--noImplicitAny` flag turned on.

To quote the article: "I’ve removed the internals for clarity"

The content of the functions is just not relevant to the point he's trying to make

Oh. I read over that. Thanks.