That's the author's oneliner. I don't know what that code is for either, which is part of I rewrote it in the second set of examples. It's normal for a oneline

That's the author's oneliner. I don't know what that code is for either, which is part of I rewrote it in the second set of examples. It's normal for a oneliner to be somewhat inscrutable though, since they're often extremely dependent on their inputs. Like if it's important to fetch the 3rd, 5th, and 7th column--why? You can't tell without the input.