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list - add class via jquery but only when not exists

I would like to add a class (class="bbox") to a ul-list but only if no class exists. This is what i have so far. How do I check with jquery if a class exists in the ul-tag?

$("ul").addClass("bbox");
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If you want to check if a specific class exists then:

 if(!$("ul").hasClass("class-name")){
    $("ul").addClass("bbox");
 }

If you want to check if any class exists:

if ($('ul').attr('class') == '') {
    $("ul").addClass("bbox");
}

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