Creational Pattern - Constructor

Constructor.js

// traditional Function-based syntax
function Hero(name, specialAbility) {
  // setting property values
  this.name = name;
  this.specialAbility = specialAbility;

  // declaring a method on the object
  this.getDetails = function() {
    return this.name + ' can ' + this.specialAbility;
  };
}

// ES6 Class syntax
class Hero {
  constructor(name, specialAbility) {
    // setting property values
    this._name = name;
    this._specialAbility = specialAbility;

    // declaring a method on the object
    this.getDetails = function() {
      return `${this._name} can ${this._specialAbility}`;
    };
  }
}

// creating new instances of Hero
const IronMan = new Hero('Iron Man', 'fly');

console.log(IronMan.getDetails()); // Iron Man can fly

For the ES5 based approach, the getDetails function should be declared on the Hero prototype.
For the ES6 based approach, the getDetails function should be a member function.