I agree. When I TA'd intro programming courses, I found that most frustration stemmed from a piece of code not doing exactly what you expect it to do. JavaScrip

I agree. When I TA'd intro programming courses, I found that most frustration stemmed from a piece of code not doing exactly what you expect it to do. JavaScript is famous for having a million quirks and places where behavior changes based on context ('this', for example). That's going to lead to a million places where students blow up because it doesn't do what they expect it to do. Students need lots of little wins, and JavaScript is full of little losses.