Question

jQuery

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allows something like:

var divs = jQuery('div');
jQuery('a', divs);

Prototype

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docs say:

$$('#navbar a', '#sidebar a');
// -> all links within the elements of ID "navbar" or "sidebar"

Which I took to mean that it is performing the same thing as this in jQuery: jQuery('#navbar a, $sidebar a');

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So I guess the question is what should the marked line be:

var divs = $$('div');
var inner_spans = $$('span', divs); // * marked line

Answer 1

The select function as Diodeus listed, is what I think I was after.

var divs  = $$('div');
var spans = [];
divs.each(function(div){
   spans.push(div.select('span'));
});

Really, the only bit I cared about was the div.select('span'), pushing them into an array wasn’t really the goal here 🙂