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No need to iterate over each li element. You can append with them in the selector
$("#second").append($('#first li'));#second {
background: green;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<ul id="first">
<li>Test</li>
<li id="test">Test 2</li>
</ul>
<ul id="second">
</ul>0
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solved Why cant I append a jquery object to a ul element