strange anonymous javascript function call
javascript
Solution
And you are right, it is an Immediately-Invoked Function Expression (IIFE)
You can rewrite
!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!
function(d, w){
...
}(document, window);
to
!function() {
...
}()
and it still works. This is because `!` is a unary operator (just like `+`, `-`, and `~` -- see https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Expressions_and_Operators). After an unary operator an expression is expected (and evaluated!). The expression can be a function call.
However
!function() {
...
}()
is just another expression, so you can put another unary operator in front of it:
+!function() {
...
}()
You can continue this pattern as you wish.
Note: Invoking an anonymous function this way, ignores the return value of the function. So only use this, if you are not interested in the return value.
Edit: Added an excellent reference to http://benalman.com/news/2010/11/immediately-invoked-function-expression/ which Daff mentioned in his answer.
Problem
I was looking at this very cool snippet and i came across this weird line in the js and deleting that prevent the function from being invoked ``` !+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+! function(d, w){ ... }(document, window); ``` ,i wrapped the function with ( ) as it supposed to be and it works as intended. ``` (function(d, w){ ... })(document, window); ``` so my question is what is that weird line and why does it work? my wild guest is that it is some kind IIFE...