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// IN ES5 ///////////////////////////////

// // Create a constructor.

function User(username, email) {
  this.username = username;
  this.email = email;
}

// // Assign methods to the prototype, so that all instances share.

User.prototype.changeEmail = function (newEmail) {
  this.email = newEmail;
};

var user = new User('MacCheese', 'macaroni@meow.com');

user.changeEmail('foo@meow.com');

// console.log(user);


// IN ES6 ///////////////////
// this is syntatic sugar on top of the old way
class User {
  constructor(username, email) {
    this.username = username;
    this.email = email;
  }
  
  // Behind the scenes, this is added to the User prototype.
  changeEmail(newEmail) {
    this.email = newEmail; 
  }
}

let user = new User('MacCheese', 'macaroni@meow.com');

user.changeEmail('foo@meow.com);

console.dir(user);

function log(strategy) {
  alert(strategy.foo);
}

// Classes are first class citizens.
// This means they can be used as values... practically anywhere.

log(new class {
  handle() {
    alert('logging with some strategy');
  }
  
  // get and set accessors.
  // could be used for computed properties.
  // get foo() {
  // return 'foo';
  // }
});

// Statics
class User {
  constructor(username) {
    this.username = username;
  }
  
  static register(username) {
    return new User(username);
  }
}

let usr = User.register('MacCheese');

console.log(user);