JSFiddle - React, Tailwind, and code Playground

HTML

<div id="d1"></div>
<div id="d2"></div>
<div id="d3"></div>

JavaScript

function addMethod(object, name, fn) {
  var old = object[name];
  object[name] = function() {
    if (fn.length == arguments.length) return fn.apply(this, arguments);
    else if (typeof old == 'function') return old.apply(this, arguments);
  };
}

function Users() {
  addMethod(this, "add", function() { 
  	document.getElementById('d1').innerHTML = 'sem parametros'; 
  });
  addMethod(this, "add", function(name) { 
  	document.getElementById('d2').innerHTML = '1 parametro';
  });
  addMethod(this, "add", function(first, last) { 
  	document.getElementById('d3').innerHTML = '2 parametros';
  });
}
 
new Users().add();
new Users().add("1");
new Users().add("1", "2");