Animal: => .
Animal.prototype.move: meters =>
  alert(this.name + " moved " + meters + "m.").

Snake: name => this.name: name.
Snake extends new Animal()
Snake.prototype.move: =>
  alert("Slithering...")
  super(5).

Horse: name => this.name: name.
Horse extends new Animal()
Horse.prototype.move: =>
  alert("Galloping...")
  super(45).

sam: new Snake("Sammy the Python")
tom: new Horse("Tommy the Palomino")

sam.move()
tom.move()