why do we need to pass in window and undefined into this jquery plugin? [duplicate]

Answer 1

this is explained very well in this video.

basically, you can set those variables in the self invoking function to ensure they work as expected.

"the asshole effect" undefined = true; -paul irish

furthermore by passing these as arguments they can also be minified.

ie.

(function(A,B,C){
    ....plugin code....
})(jQuery,this);