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Possible Duplicate:
What does the leading semicolon in JavaScript libraries do?
I have noticed a lot of jQuery plugins start with
;(function(){ /* something in here */ })();
I just wondered what the beginning semi-colon was for, as well as the empty parentheses at the end.
The semi-colon is there in case you include this script just after some ‘bad’ script that doesn’t properly close off its last line with a semi-colon. In this case it’s possible the two scripts would be combined and result in invalid code. For example if you are merging multiple script into a single response.
The () at the end is executing the function. This is creating a closure. Private variables and methods can be declared within the scope of this function that cannot be accessed from outside the script.