polymorphism.js

let movie1 = function () {}
movie1.prototype.description = function() {
   return "description of movie1"
}
let movie2 = function() {}
movie2.prototype = Object.create(movie1.prototype);
movie2.prototype.description = function() {                
   return "description of movie2"
}
let movie3 = function() {}
movie3.prototype = Object.create(movie1.prototype);
movie3.prototype.description = function() {
   return "description of movie3"
}
   
let movies = [new movie1(), new movie2(), new movie3()];
movies.forEach(function(movie){
   console.log(movie.description());
});