Search code examples
javascriptfunctionsizzle

JavaScript !function(){}

when looking at the minified Sizzle code, I noticed that it begins like this:

!function(a){//...

  }(window)

Why is there an exclamation point at the beginning?

I thought that ! was the not operator.

Thank you.

Edit:

Full Code.

Solution 
  • !function(a){/* ... */}();

    Using an unary operator to invoke an IIFE is common practice. That's a common shorthand for:

    (function(a){/* ... */}());

    or:

    (function(a){/* ... */})();

    You can also substitute the not unary operator with any other unary operator:

    -function(a){ /* ... */ }();
+function(a){ /* ... */ }();
/* ... etc. */