JSFiddle - React, Tailwind, and code Playground
HTML
<div class="box"></div>
CSS
.box{
width:100px;
height:100px;
background-color:'red';
}
JavaScript
var arr = [7,8,5,63,8,2,1];
var uniq = arr.reduce((num,sum)=>num+sum,0);
console.log(uniq);