JSFiddle - React, Tailwind, and code Playground

JavaScript

var amer = "america"; 
var markerGroups = {america: [2], "europa": [3], "asia": [4], "africa": [5], "oceania": [6, 5] };  
for (var i in markerGroups)
    document.body.innerHTML += markerGroups[i] + "<br />";