More fun Javascript enclosures

enclosures.js

Instead of the "traditional":

(function() {

})();


You can do:

!function(){
    //I saved some characters, and now I'm trendy.
}();


Or:

+function(){
    //If you're a hipster and just can't be like everybody else (scoff, so main stream), the '+' means better.
}();

Interesting, why does this work?

Interesting :)

I think it works because the parenthesis, !, + and - signs force the JavaScript parser/engine treat the following entity (in this case the function declaration followed by the (), which return a value ) as on object, because those signs start an expression and it will make the parser use the returned value from that function as the second term on the expression. Testing it on the console you can see that it will return a value.
The traditional way returns undefined, but the others will return a boolean or NaN value.

On the simple function declaration the following () whould break the syntax, this is way it requires those signs before.