Why does jQuery pass the window object into their scope [duplicate]

Answer 1

You can access faster to local vars, also you can shorten the variable name "window" (and even "document") with something like:

(function(w, d)(){

    // use w and d var

})(window, document)

Answer 2

Yes! Since the window in this function is a local variable now it allows minify its name. Also access to the local variables should be faster than to the global ones.