prototype_example.js

var Movie = function(title,year,rating) {
  this.title = title;
  this.year = year;
  this.rating = rating;
  this.full_title = function() { // "instance method"
    return(this.title + ' (' + this.year + ')');
  };
};
function Movie(title,year,rating) {  // this syntax may look familiar...
  // ...
}
// using 'new' makes Movie the new objects' prototype:
pianist = new Movie('The Pianist', 2002, 'R');
pianist.full_title;   // => function() {...}
pianist.full_title(); // => "The Pianist (2002)"
// BAD: without 'new', 'this' is bound to global object in Movie call!!
juno = Movie('Juno', 2007, 'PG-13'); // DON'T DO THIS!!
juno;               // undefined
juno.title;         // error: 'undefined' has no properties
juno.full_title();  // error: 'undefined' has no properties