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var $this = $(this);
Given the above, which is faster: $(".elt", $this) or $this.find(".elt")?
I ask because the first seems a bit more concise, but if it converts to $($this).find(".elt") [sic], it seems that it could in fact be slower.
It is much faster to use
$("#elt")since there is only one element with anid="elt"that is a valid element. (ID’s MUST BE UNIQUE)Edit: If you were only using that as an example, and the same question applies to using a class instead of an ID, Both ways should be relatively the same due to the way jquery works internally.
$(".elt", $this)converts to$this.find(".elt")which is identical to$this.find(".elt").You may find a difference between the two after running several thousand iterations of it at once, but in normal circumstances, you are better off using the one that is easier to read.