JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://dev.mybackupbox.com/js/libs/jqBootstrapValidation.js"></script>
<form>
  <input type="checkbox">
  <input type="checkbox">
</form>

JavaScript

$(document).ready(function(){
    var $a = $("input");
    var $b = $a.map( function () {
        var $this = $(this);
          return $this.parents("form")[0];
        }
     );      
    $.unique($b);
    alert("fail");
  });