Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  Benchmark.prototype.setup = function() {
    var $wrapper = $("#wrapper");
  };
</script>

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$wrapper.addClass("hover");

if ($wrapper[0]) {
  $wrapper.addClass("hover");
}

if ($wrapper.length > 0) {
  $wrapper.addClass("hover");
}

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