Argument order: jQuery $.each(collection,function(){ this.bla(); }); The reason index is first param is because wheb you need it it is the only param. The

Argument order: jQuery $.each(collection,function(){ this.bla(); }); The reason index is first param is because wheb you need it it is the only param. The reason for the item param is incase you need to attach a scope object to be this!