JavaScript ES6

class.js

// Old way...
function Person(name) {
  this._name = name;
};

Person.prototype.getName = function() {
  return this._name;
};

person = new Person('Foo');
console.log(person.getName());

// New way...
class Person {
  constructor(name) {
    this._name = name;
  }
  getName() {
    return this._name;
  }
}

person = new Person('Bar');
console.log(person.getName());