I'd honestly rather have a,b,c than that! Nobody writes code with such placeholder variable names, so why demonstrate it that way?

Placeholder variables like i and j don't count! Foo, Baz, etc are annoying to read too, IMO.

I use foo, bar, baz, etc. all the time when I’m writing tests. But I agree generally it is better when examples use meaningful name `cd /path/to/file` as oppose to `cd /foo/bar/baz`

What's wrong with FOO? It's fun to say and can use it almost anywhere when you need a random word. Has saved me seconds here and there when I didn't need to think of a word because I have FOO :)