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An example from dataTable shows:
var cell = $('td:eq(2)', nRow);
nRow is a DOM node passed in by dataTable. Sure enough, this grabs the second td in nRow. The question is, why? Where is this syntax documented?
Yes, it’s documented.
Here: jQuery( selector, [context] )
The second parameter is the context where the selector is applied. It can be a DOM element, the
documentobject, or a jQuery object.