First off it is short and concise, and I think it is very informative. ..,but thinking of Complete beginners? You need to make it more approachable. "What is

First off it is short and concise, and I think it is very informative. ..,but thinking of Complete beginners? You need to make it more approachable. "What is javascript good for?" might be a good - maybe cite some real-life basic examples of javascript in use. Also having a slide at the end showing examples of what javascript is capable of doing. (with a lot of effort) The "what does this do?" example is not very interesting.. I didn't want to know what it does. (this may be dependent on the audience) As an alternate you could make this interesting where you have an array of words (that could lead to some humorous results) and the code puts out some clever phrase. (Shakespearean insult generator comes to mind, that might be inappropriate though, maybe work up a surfer compliment generator or something.) besides being interesting to read it could then be modified by the students to create other generators, etc. - that give some quick positive feedback of working with live code.