Well, I learned something new from most of the points mentioned.
Only thing I would take exception to is:
>Those 1.0s are telling. Languages like Java represent integers (1) differently from floating point numbers (1.0). In JavaScript, however, numbers are numbers. (1 - factor) would have worked just as well.
It works just as well but the code seems to be clearer (without any loss of functionality or performance) for explicitly making it a '1.0'
Yes this point was particularly ridiculous. Yes, this is a convention from Java (and C++), but I actually do this in my JS code as well. Every minifier will easily fix this for you, and in my opinion it makes things clearer. In fact, there exists an argument that this form of clarity is more important in a language like JavaScript precisely because you don't have a type system (in other words, seeing a 1.0 when an operation should clearly be dealing with ints can flag incorrect logic).
Only thing I would take exception to is:
>Those 1.0s are telling. Languages like Java represent integers (1) differently from floating point numbers (1.0). In JavaScript, however, numbers are numbers. (1 - factor) would have worked just as well.
It works just as well but the code seems to be clearer (without any loss of functionality or performance) for explicitly making it a '1.0'