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As a example of jQuery code (https://coderwall.com/p/7uchvg), I read that the expression $('#foo a'); behaves like this:
Find every
ain the page and then filterainside#foo.
And it does not look efficient.
Is that correct? And if yes, how should we do that in a better way?
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The jQuery Object: The Wrapped Set: Selectors return a jQuery object known as the "wrapped set," which is an array-like structure that contains all the selected DOM elements. You can iterate over the wrapped set like an array or access individual elements via the indexer ($(sel)[0] for example).
Description. "$("div p")" Selects all elements matched by <div> that contain an element matched by <p>.
That is correct - Sizzle (jQuery's selector engine) behaves the same way as CSS selectors. CSS and Sizzle selectors are evaluated right-to-left, and so #foo a will find all a nodes, then filter those by nodes that descend from #foo.
You improve this by ensuring that your leaf selectors have a high specificity, usually by giving them a class or ID.
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