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Array.prototype.diff = function(that) {
    return {
        enter: $(that).not(this).get(),
        exit: $(this).not(that).get()
    };
};

//Example:
//var result = [0,1,2,3,4,5].diff([1,2,3,4,5,6,7]); 
// result will be {enter:[6,7], exit:[0]}
// 6 and 7 are added, 0 is removed