JSFiddle - React, Tailwind, and code Playground

by mblase75

HTML

<a href="#" data-index="3">link 1</a>
<a href="#" data-index="6">link 2</a>
<a href="#" data-index="21">link 3</a>
<a href="#" data-index="1">link 4</a>

JavaScript

var tarr = $('a').map(function() {
    return $(this).data('index');
}).toArray();
alert( Math.max.apply(Math,tarr) );