Professional JavaScript for Web Developers, Pro Javascript Techniques, Ecma 262 Spec , O'Reilly Definitive 5th Edition, Javascript: The Good Parts are books I'

Professional JavaScript for Web Developers, Pro Javascript Techniques, Ecma 262 Spec , O'Reilly Definitive 5th Edition, Javascript: The Good Parts are books I'd recommend for learning JS, and most of the authors have experience with various languages ( though none of them are really geared toward a Pythonista ). You could create your own custom function that emulates Python's set, but you can't do advanced expressions such as using the binary minus with 2 operands ( sets ) on either side. You'd have to do something like set.diff( firstArray, secondArray ).