JSFiddle - React, Tailwind, and code Playground

JavaScript

var _map = {
    'severity-normal': 0,
    'severity-minimal': 0,
    'severity-moderate': 0,
    'severity-severe': 0,
    'severity-highly-severe': 0
};

var _mapIndexes = Object.keys(_map);

var top3 = [];

for (var i=0; i<_mapIndexes.length; i++) {
	// i = the index of the _map key
  // _mapIndexes[i] = the index in the _map object
  // _map[_mapIndexes[i]] = the object
  
  if (i > 2) break;
  $('body').append('Key: '+_mapIndexes[i]+' Value: '+_map[_mapIndexes[i]]+'<br />')
  top3.push(_map[_mapIndexes[i]])
}