How do you check if an element exists in jQuery?

<p id="a">A</p>

console.log($('#a').length > 0);
console.log($('#missing').length > 0);
if ($('#missing').length) { console.log('found'); } else { console.log('not found'); }

A selector which finds nothing returns an empty jQuery object, and the methods then do nothing. See jQuery Selectors.

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