Playing with ECMAScript 4 (Screencast)

Hi All - I just posted a quick screencast demonstrating how to get started with ECMAScript 4 (although, if you're already subscribed to this list, it's probably a good bet that this is well below your skill level). Feedback is appreciated. http://ejohn.org/blog/playing-with-ecmascript-4/

Re: need some clarification on compile-time type vs. run-time type

Yuh-Ruey Chen wrote: I'm not sure how to phrase this, but it seems to me that ES4 is trying to make fixed properties and non-fixed properties (and by extension, type expressions and value expressions, and compile-time features and run-time features) as similar and compatible as possible (e.g.