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

Defining functions

Function syntax might be the single most-talked-about feature of CoffeeScript. It's notable because it is strange: it doesn't feel familiar to a programmer coming from JavaScript (or from most other languages, for that matter). You might not like it immediately, but give it some time and you'll find it grows on you. Like a foreign language, at first you may need to pause and translate the syntax back into a familiar form. Give your brain a little time to rewire, though, and soon you'll be able to read and understand CoffeeScript instantly.

Let's look at the following example:

(name) ->
  return "Hello, #{name}!"

This is a simple anonymous function that takes one argument, name, and returns a message saying hello. If you're puzzled, let's take a look at the resulting JavaScript:

(function(name) {
  return "Hello, " + name + "!";

The arguments declaration remains the same. JavaScript's function keyword and curly brace are replaced by a ->. Just like the if statements...