> In my opinion discard the data, saving the cost of a DOM access.
Afaik, setting/getting .data() does not include an additional
performance penalty (as in page reflow), since jQuery's global cache
object is used to store the data.
If a reference to the DOM element exists beforehand, ergo, no selector
query is performed, then:
$( elem ).data( 'arr', arr );
and
$( elem ).data( 'arr' );
perform well.
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