JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
   <div class="A">A</div>
   <div class="A">A</div>
   <div class="B">B</div>
   <div class="B">B</div>
</div>

JavaScript

$('.A + .B').each(function() {
    $(this).insertBefore($(this).prev());
});