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

A new idiom: options objects

Now we're going to look at an idiom for passing options to a function. This isn't a new feature of CoffeeScript. Instead, it's a convention that makes use of several CoffeeScript features we've already learned, and uses them in a pattern that is easy to understand and useful in a wide variety of situations.


This idiom is also common in Ruby programs. Ruby makes extensive use of hashes (the equivalent of simple objects), and has loose syntax rules (much like CoffeeScript) allowing hashes to be passed to functions without extra noise. Other languages, such as Python, offer similar benefits via named arguments.

The idea is simple: a function accepts an options object, which may contain keys for any less-common or less-obvious function arguments. This makes the options easier to understand from the code calling the function because there are keys to identify what each value does. It also alleviates the problems of keeping track of arguments and argument order...