Book Image

CoffeeScript Application Development

By : Ian Greenleaf Young
Book Image

CoffeeScript Application Development

By: Ian Greenleaf Young

Overview of this book

JavaScript is becoming one of the key languages in web development. It is now more important than ever across a growing list of platforms. CoffeeScript puts the fun back into JavaScript programming with elegant syntax and powerful features. CoffeeScript Application Development will give you an in-depth look at the CoffeeScript language, all while building a working web application. Along the way, you'll see all the great features CoffeeScript has to offer, and learn how to use them to deal with real problems like sprawling codebases, incomplete data, and asynchronous web requests. Through the course of this book you will learn the CoffeeScript syntax and see it demonstrated with simple examples. As you go, you'll put your new skills into practice by building a web application, piece by piece. You'll start with standard language features such as loops, functions, and string manipulation. Then, we'll delve into advanced features like classes and inheritance. Learn advanced idioms to deal with common occurrences like external web requests, and hone your technique for development tasks like debugging and refactoring. CoffeeScript Application Development will teach you not only how to write CoffeeScript, but also how to build solid applications that run smoothly and are a pleasure to maintain.
Table of Contents (19 chapters)
CoffeeScript Application Development
About the Author
About the Reviewers

Alternatives for managing asynchronous calls

We've now seen the general pattern for performing multiple asynchronous operations at once. While it wasn't too difficult to keeping track of the pending requests by hand, it can become tiresome if you have to do this often. It can also become more complex if you do not have as simple a starting point as the length of an array; for example, if you only perform a request when certain conditions are met, or if you perform more than one request per item.

There are a number of solutions available to help you manage asynchronous control flow. We'll look at a few of these and try applying them to our application. These are completely optional! There's nothing wrong with the code we just wrote, and in subsequent chapters we will continue to use that version. But it's a good idea to know what your options are, especially if you end up working on an application with a large number of complex asynchronous operations.


The first solution we'll explore...