JSFiddle - React, Tailwind, and code Playground

HTML

<h2>This should be true:</h2>
<p><code>x['leng' + 'th'] *2 == x['leng' + 'th'] + x['leng' + 'th']</code></p>


<div id="output"></div>

CSS

#output {
 color: blue;  
font-size: 10em;
text-transform: uppercase;    
}

JavaScript

var x= 'a';

document.getElementById('output').textContent = (x['leng' + 'th'] *2 == x['leng' + 'th'] + x['leng' + 'th']).toString();