Preparation code

<div class="foo1">
<div class="foo2">
<div class="foo3">
<div class="foo4">
</div>
</div>
</div>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 

Preparation code output

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$('.foo4').parents().is('.foo2') == true

$('.foo4').closest('.foo2').length > 0

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