oop.js

/*
 * Person class
 */
function Person(name) {
  this.name = name;
  this.hi = function() {
    console.log(this.name + " says hi!");
  };
  console.log('made a person');
}
dave = new Person('dave');
dave.hi();



/*
 * Person class, hi function
 * added to prototype
 */
function PersonB(name) {
  this.name = name;
  console.log('made a PersonB');
}

PersonB.prototype = {
    hi: function() {
        console.log("" + this.name + " says hi!");
    }
};

andy = new PersonB('andy');
andy.hi();