Great point:

    This whitespace zig-zaging is barely readable.

I considered an example like this in the post, but it confuses accidental with essential complexity. If you’re going to do all of that, then I suggest that significant indentation is a win over everything being a chain and using something like jQuery’s `.end()` to discriminate chaining from cascading.

It’s a lot easier to spot an error in indentation than a missing `.end()`. That being said... This could be a false dichotomy. Perhaps the right thing to do is use named temporary variables or structure the code another way.

Although I don’t see a ton of it in the wild, it’s 100% valid to write your own custom jQuery traversals, filters, and so forth. my own jQuery Combinators includes `.K` and `.T` combinators so that you can break code up into functions so you don’t need to write elaborate trees.

So... I agree that an elaborate tree is a difficult problem to handle, and perhaps neither significant whitespace nor `.end()` is the answer. But for the limited and possibly artificial choice of a fluent interface OR significant whitespace, I prefer significant whitespace.