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rated 0 times [ 60] [ 4] / answers: 1 / hits: 15498 / 13 Years ago, thu, march 24, 2011, 12:00:00

Possible Duplicate:

What does the exclamation mark do before the function?

I saw a function formatted like this today for the first time:

!function(){}();

What is the preceding exclamation mark for? I assume it functions the same as:

(function(){})();

But... what's going on here?

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4 Years ago

answered 13 Years ago christianu · Accepted Answer

The preceding ! takes the un-parseable statement, and allows it to to be parsed by the JS engine, which in turn returns true.

function(){}();

SyntaxError: Unexpected token (



!function(){}();

>>true