Programming in CoffeeScript: Existential Operator Tips

Programming in CoffeeScript: http://www.informit.com/store/programming-in-coffeescript-9780321820105
Use CoffeeScript to Write Better JavaScript Code Than Ever Before!

If you can do it in JavaScript, you can do it better in CoffeeScript. And, since CoffeeScript "compiles down" to JavaScript, your code will fit neatly into virtually any web environment. InProgramming in CoffeeScript, Mark Bates shows web developers why CoffeeScript is so useful and how it avoids the problems that often make JavaScript code buggy and unmanageable. He guides you through every feature and technique you need to write quality CoffeeScript code and shows how to take advantage of CoffeeScript's increasingly robust toolset.

Bates begins with the absolute basics of running and compiling CoffeeScript and then introduces syntax, control structures, functions, collections, and classes. Through same page code comparisons, you'll discover exactly how CoffeeScript improves on JavaScript. Next, you'll put it to work in building applications that are powerful, flexible, maintainable, concise, reliable, and secure. Bates shares valuable tips for better development, illuminating CoffeeScript's hidden gems and warning you about its remaining "rough edges." The book concludes with a start-to-finish application case study showing how to code back-ends and front-ends and integrate powerful frameworks and libraries. Coverage includes
• Understanding the right ways to compile and execute CoffeeScript
• Using CoffeeScript's clean syntax to focus on your code, not JavaScript's distractions
• Working with CoffeeScript's control structures, functions, and arguments
• Taking full advantage of CoffeeScript's implementation of collections and iterators
• Leveraging CoffeeScript's full class support to create complex data models
• Automating common application development tasks with Cake and Cakefiles
• Configuring Jasmine with CoffeeScript support, and using it to systematically test your code
• Writing Node.js server-side applications in CoffeeScript
• Using CoffeeScript to write jQuery and Backbone.js applications
• Integrating framework code to avoid "reinventing the wheel"
Want a better way to create the JavaScript code your web applications need? CoffeeScript is the solution--and this book will help you master it!

Table of Contents
Dedication v
Acknowledgments xii
About the Author xiv
Preface xv
What Is CoffeeScript? xvii
Who Is This Book For? xix
How to Read This Book xix
How This Book Is Organized xxi
Part I: Core CoffeeScript xxii
Part II: CoffeeScript in Practice xxii
Installing CoffeeScript xxiii
How to Run the Examples xxiii
Notes xxiv
Part I: Core CoffeeScript
1 Getting Started 3
The CoffeeScript REPL 3
In-Browser Compilation 6
Caveats 7
Command-Line Compilation 7
The compile Flag 7
The CoffeeScript CLI 8
The output Flag 9
The bare Flag 9
The print Flag 10
The watch Flag 10
Executing CoffeeScript Files 11
Other Options 11
Wrapping Up 12
Notes 12
2 The Basics 13
Syntax 13
Significant Whitespace 14
Function Keyword 16
Parentheses 16
Scope and Variables 18
Variable Scope in JavaScript 18
Variable Scope in CoffeeScript 19
The Anonymous Wrapper Function 20
Interpolation 23
String Interpolation 23
Interpolated Strings 23
Literal Strings 25
Heredocs 28
Comments 29
Inline Comments 29
Block Comments 30
Extended Regular Expressions 31
Wrapping Up 31
Notes 32

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