#1
elevator.on("floor_button_pressed", function(floorNum) {
 elevator.goToFloor(floorNum);
});

#2
elevator.on("stopped_at_floor", function(floorNum) {
  elevatorFloorNum = floorNum;
});

#3
elevator1.on("idle", function() { 
 if(elevator1.currentFloor() > 0)
     elevator1.goToFloor(elevator1.currentFloor()-1);
 else
  elevator1.goToFloor(elevator1.currentFloor()+1);
});
elevator1.on("floor_button_pressed", function(floorNum) {
 elevator1.goToFloor(floorNum);
});
elevator1.on("stopped_at_floor", function(floorNum) {
  elevatorFloorNum1 = floorNum;
});

#4