Example 2-5. One promise with multiple consumers

var user = {
	profilePromise: null,
	getProfile: function () {
		if (!this.profilePromise) {
			// Assume ajax() returns a promise that is eventually
			// fulfilled with {name: 'Samantha', subscribedToSpam: true}
			this.profilePromise = ajax(/*someurl*/);
		}
		return this.profilePromise;
	}
};

var navbar = {
	show: function (user) {
		user.getProfile().then(function (profile) {
			console.log('*** Navbar ***');
			console.log('Name: ' + profile.name);
		});
	}
};

var account = {
	show: function (user) {
		user.getProfile().then(function (profile) {
			console.log('*** Account Info ***');
			console.log('Name: ' + profile.name);
			console.log('Send lots of email? ' + profile.subscribedToSpam);
		});
	}
};

navbar.show(user);
account.show(user);

// Console output:
// *** Navbar ***
// Name: Samantha
// *** Account Info ***
// Name: Samantha
// Send lots of email? true