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Is there an efficiency difference between finding by id and finding by class with JavaScript/jquery?
Is one better than the other? If so is it because indexes of ID or Class are made in the DOM somewhere?
Does it end up not mattering much?
Finding by ID is always faster, no matter where (
getElementById(),$('#id'), or even in regular CSS).Since ID’s are unique per page, they’re much faster to find.
In addition, when using
$('#id'), jQuery will map that back to the built-ingetElementById(), which is the fastest way to query the DOM.