I think you were being downvoted because some people (myself included) roll their eyes when they hear about Javascript yet again. It goes double when there is a good language already out there (I accept Objective C with its warts. Swift actually has me excited to make something).

It actually kind of cool. And the Temperature Converter example showed a lot of the dynamic nature of the objective C runtime. This one presentation actually piqued my interest in looking at os x scripting.