Question

In the following code there is “function(i)”, but “i” hasn’t been declared anywhere previous to this statement.

ul.css({width: 10, overflow: 'visible'}).retarder(100, function(i){
   i.css('visibility',  'visible').animate(
      {width: ul[0].wid,left:-50},
      {duration: 500, complete : function(){
         ul.css('overflow',  'visible');
      }}
   );
});

It looks like it could be similar to a c++ “this” statement. Is that correct at all?

Answer 1

i is just a function parameter that is passed by retarder function to the anonymous function.

What it does is:

ul.css({width: 10, overflow: 'visible'}).retarder(100, callback_function);

and callback is defined via anonymous function:

function(i) { ... }  

So that i is definition of the parameter of the anonymous function.