Possible Duplicate: What does the exclamation mark do before the function? What’s the point

Question

Editorial Team

Asked: June 6, 20262026-06-06T17:14:02+00:00 2026-06-06T17:14:02+00:00

Possible Duplicate:
What does the exclamation mark do before the function?

What’s the point of the ! in the snippet bellow?

!function ($) {

   // code

}(window.jQuery);

This syntax is used extensively in Twitter’s bootstrap.js

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Editorial Team · Answer 1 · 2026-06-06T17:14:04+00:00

Editorial Team

they are calling the function right after the declaration (with window.jQuery as a parameter)

another syntax is:

(function ($) {

   // code

})(window.jQuery);

some people care more about one character than readability

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