JSFiddle - React, Tailwind, and code Playground

HTML

<div id="result"></div>

JavaScript

var arr = [ 3, 2, 8, 1, 5, 1 ];
var predicate = function(a, b) {
    if(a < b) return -1;
    else if(a > b) return 1;
    else return 0;
};

document.getElementById("result").innerHTML = "[" + arr.sort(predicate) + "]";