check if it is slider 1 or 2

check if it is slider 1 or 2

hello i have a slider with two handles, how can i check which handle is moving?

slide: function(event, ui) {
              
                //something like this
                  if(ui.handle == 1 )
                  {
                        //do something with handle value 1 :  ui.values[0];
                  }
                 if(ui.handle == 2 )
                  {
                      //do something with handle value 2 :   ui.values[1];
                  }
            }