JSFiddle - React, Tailwind, and code Playground
HTML
<div></div>
<div></div>
<div></div>
<div></div>
<p></p>
JavaScript
var $divs = $('div'),
$p = $('p'),
array = $divs.get();
$divs.each(function(i, elem) {
console.log('inArray for %o: %d', elem, $.inArray( elem, array ) );
});
console.log('inArray for %o: %d', $p[0], $.inArray( $p[0], array ) );