JSFiddle - React, Tailwind, and code Playground

HTML

<div id="first" data-portlet="151" class="portlet new" >some content here</div>

<div id="another"></div>

JavaScript

$('.portlet').each(function() {

    var obj = $(this),
        objD = $(this).data();
    
    $('#another').addClass( 'portlet_' + objD.portlet + ' ' + 'portlet_content_' + objD.portlet ).html( $('#another').attr('class') )
    
});