Open web gives us a unique opportunity to learn about web technologies from the web itself. The source of every web page, stylesheet or script is only few clicks away, so it can easily become a learning material. I strongly believe that—as the builders of the web—we should care especially about those visitors of our web sites who want to learn something from our code. … And yes – the word ‘learn’ will occur many times in many forms during this talk.

Douglas Crockford’s Function Challenges. Test your knowledge of function scope and and learn to compose functions that can be called multiple times through function returns.