I would like to propose .attr (and other such functions) to accept a function as its only argument, which returns an object.

$("a").attr(function() {
  return {
    target: "_blank",

    // using an object directly wouldn't allow this line:
    href: $(this).data("foo")
  };
});

This is currently possible using .each. Given that functions can be passed to e.g. .attr when only one attribute is passed (.attr(str, func)), I think it would be useful to have this syntax available, too.

Thanks for taking this into consideration.