Example 4-3. Using the enclosing scope through function.bind() or aliasing

var printer = {
	pageSize: 'US LETTER',

	connect: function () {
		// Return a promise that is fulfilled when a connection
		// to the printer is established
	},

	configure: function (pageSize) {
		return this.connect().then(function () {
			console.log('Setting page size to ' + pageSize);
			this.pageSize = pageSize;
		}.bind(this)); // Using bind to set the context
	},

	print: function (job) {
		// Aliasing the outer context
		// _this, that, and self are some other common alias names
		var me = this;
		
		return this.connect().then(function () {
			console.log('Printing job using page size ' + me.pageSize);
		});
	}
};

printer.configure('A4').then(function () {
	return printer.print('Test page');
});

// Console output:
// Setting page size to A4
// Printing job using page size A4