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function checkArrayDifferences (array1, array2) {
    "use strict";
    var removed = $(array1).not(array2).get(),
        added = $(array2).not(array1).get();
    return {'removed': removed, 'added': added};
}

var array1 = [1,2,3,4],
    array2 = [2,3,6],
    differences;

differences = checkArrayDifferences(array1, array2);

window.console.log(differences);