Example 4-4. Setting callback contexts using promise.bind()

printer.shutdown = function () {
	this.connect().bind(this).then(function() { // bluebird.bind not function.bind
		console.log('First callback can use ' + this.paperSize);
	}).then(function () {
		console.log('And second callback can use ' + this.paperSize);
	});
};

// Console.output:
// First callback can use A4
// And second callback can use A4