Developers in the Ruby world who’ve heard Mark Bates speak at confabs like RubyConf and RailsConf know him as an engaging advocate for CoffeeScript, the "It’s just JavaScript" language. He’s followed CoffeeScript since its infancy, wrote a definitive book on the topic in 2012, and uses it in the work he performs for his top tier clients. Who better to show you the core of CoffeeScript and the cool hidden things inside it than Bates himself?

In this video, he uses his friendly conversational approach and hands-on exercises to move you through five key components of this must-know language.

• Discover the differences of using a fat arrow vs. a skinny arrow when defining functions
• Learn the quickest way to test JavaScript in a Rails application
• Explore how to add client-side subscriptions using EventSource and the Sinatra streaming API
• Generate source map files and use them to debug CoffeScript code in the browser
• Build a jQuery plug-in using Jasmine, Guard, and test driven development