JSFiddle - React, Tailwind, and code Playground

by _sir

HTML

<h3>Take an array and return the number of unique duplicates in it</h3>

<p>
<strong>Your answer should be: </strong>0, 1, 2
</p>
<div id="output"></div>

JavaScript

var arr = [[1, 2, 3],[1, 1, 2, 3],[1, 2, 2, 3, 3, 3]];



document.getElementById("output").innerHTML = '';