código 1
var User1 = function (name, age) { this.name = name; } User1.prototype.getName = () => { return this.name; } var x = new User1("gladiator"); console.log(x.getName());Salida = indefinido
codigo 2
var User1 = function (name, age) { this.name = name; } User1.prototype.getName = function () { return this.name; } var x = new User1("gladiator"); console.log(x.getName());Salida = gladiador