JSFiddle - React, Tailwind, and code Playground

JavaScript

var x = {"_11":1, "_22": 2, "_55": 3, "_44":4};
var y = {"11":1, "22": 2, "55": 3, "44":4};

var output = '';
output += '<br />With "_" prefix: <br />';
for(var a in x) output += 'x obj: '+x[a] + "<br />";

output += '<br />Without "_" prefix: <br />';
for(var a in y) output += 'y obj: '+y[a] + "<br />";

document.body.innerHTML = output;