Altairchen's solution

{ init: function(elevators, floors) { var top = floors.length - 1; var floor_pushup_list = []; var floor_pushdown_list = []; // tool Array.prototype.remove = function(val) { var index = this.indexOf(val); if (index > -1) { this.splice(index, 1); } }; // log var mode = "0"; function myalert(msg) { if (mode == "1") { window.alert(msg); } };

    // elevator
    for (i=0;i< elevators.length; i++) {
        let j =i;
        // Whenever the elevators[j] is idle (has no more queued destinations) ...
        elevators[j].on("idle", function() {
            // let's go to all the floors (or did we forget one?)

            if (elevators[j].currentFloor() == 0)
                elevators[j].goToFloor(top);
            else if (elevators[j].currentFloor() == top)
                elevators[j].goToFloor(0);
        });        
        elevators[j].on("passing_floor", function(floorNum, direction) {
            var stop=false;
            if (elevators[j].loadFactor() < 0.7 &&
                ((direction=="up" && floor_pushup_list.includes(floorNum)) ||
                (direction=="down" && floor_pushdown_list.includes(floorNum)))) {
                stop = true;
            }
            if(stop || elevators[j].getPressedFloors().includes(floorNum)) {
                elevators[j].goToFloor(floorNum,true);
                if (elevators[j].destinationQueue[1] > floorNum) {
                    elevators[j].goingUpIndicator(true);
                    elevators[j].goingDownIndicator(false);
                } else {
                    elevators[j].goingUpIndicator(false);
                    elevators[j].goingDownIndicator(true);
                }
                if(direction=="up") {
                    floor_pushup_list.remove(floorNum);
                }
                if(direction=="down") {
                    floor_pushdown_list.remove(floorNum);
                }
            }
        });
        elevators[j].on("stopped_at_floor", function(floorNum) {
            if (floorNum == 0) {
                elevators[j].goingUpIndicator(true);
                elevators[j].goingDownIndicator(false);  
            } else if (floorNum == top) {
                elevators[j].goingUpIndicator(false);
                elevators[j].goingDownIndicator(true);  
            }
        })

        elevators[j].on("floor_button_pressed", function(floorNum) {
            // Maybe tell the elevators[j] to go to that floor?
        });
    }

    // floor
    for (i=0;i< floors.length; i++) {
        let j = i;
        floors[j].on("up_button_pressed", function (){
            // Maybe tell an elevators[j] to go to this floor?
            //wmyalert(j+"th floor push up");
            if (!floor_pushup_list.includes(j))
                floor_pushup_list.push(j);

        });
        floors[j].on("down_button_pressed ", function() {
            // Maybe tell an elevators[j] to go to this floor?
            //myalert(j+"th floor push down");
            if (!floor_pushdown_list.includes(j))
                floor_pushdown_list.push(j);
        });
    }

},
update: function(dt, elevators, floors) {
    // We normally don't need to do anything here
}

}