[JSMentors] self executing function

[Pete]

Hi,
could anyone explain me the difference in using "!" or ";" in front of
"function() {}();"

thanks

pete

    //seen at 
https://github.com/twitter/bootstrap/blob/master/js/bootstrap-alerts.js
    !function( $ ){
    }( window.jQuery || window.ender );


    //seen at https://github.com/madrobby/keymaster/blob/master/keymaster.js
    ;(function(global){
    })(this);

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