index.js

// es5 prototype syntax

function Hero(name, level) {
  this.name = name;
  this.level = level;
}

Hero.prototype.shout = function() {
  return `I'm ${this.name}!`;
};

function Power(heroName, heroLevel, power) {
  Hero.call(this, heroName, heroLevel)
  this.power = power
}

Power.prototype = Object.create(Hero.prototype)

const money = new Power("batman", 1000, "money")

console.log(money.shout())

// es6 prototype syntax

class Hero {
  constructor(name, level) {
    this.name = name
    this.level = level
  }

  shout() {
    return `I'm ${this.name}!`;
  }
}

class Power extends Hero {
  constructor(heroName, heroLevel, power) {
    super(heroName, heroLevel)
    this.power = power
  }

  static awesome() {
    return "im awesome"
  }
}

const money = new Power("batman", 1000, "money")
console.log(money.shout())

index.rb

class Hero 
  def initialize(name, level) 
    @name = name
    @level = level
  end

  def shout 
    "I'm #{@name}"
  end 
end 

class Power < Hero 
  def initialize(name, level, power)
    super(name, level)
    @power = power
  end 

  def self.awesome 
    return "im awesome"
  end 

  private 

  def listing_params 
  end 
end 

money = Power.new("batman", 1000, "money")
p money.shout
p Power.awesome