My entry for http://play.elevatorsaga.com/

elevator_saga.js

{
    // Docs: http://play.elevatorsaga.com/documentation.html#docs
    init: function(elevators, floors) {
        console.log("init() with " + elevators.length + " elevators and " + floors.length + " floors");
        for (var i=0; i<elevators.length; i++) {
            (function(elevator) {
                elevator.myNum = i;
                elevator.log = function(text) {
                    console.log("Elevator[" + elevator.myNum + "] " + text);
                }
                elevator.on("idle", function() {
                    //var idleFloor = floors.length / 2 - 1;
                    //if (idleFloor < 0) {
                    //    idleFloor = 0;
                    //}
                    var idleFloor = 0;
                    console.log("idle, going to floor " + idleFloor);
                    elevator.goToFloor(idleFloor);
                    //console.log("done idling");
                });
                elevator.on("floor_button_pressed", function(floorNum) {
                    console.log("floor_button_pressed " + floorNum + " (current destinationQueue: " + elevator.destinationQueue + ")");
                    (function(elevator, floorNum) {
                        if (elevator.destinationQueue.indexOf(floorNum) != -1) {
                            elevator.log("floorNum is already in my queue");
                            return;
                        }
                        if (elevator.goingUpIndicator() && floorNum < elevator.currentFloor()) {
                            console.log("goingUpIndicator but floorNum (" + floorNum + ") < currentFloor (" + elevator.currentFloor() + ")");
                            console.log("adding to end of queue");
                            elevator.goToFloor(floorNum);
                            return;
                        }
                        if (elevator.goingDownIndicator() && floorNum > elevator.currentFloor()) {
                            console.log("goingDownIndicator but floorNum (" + floorNum + ") > currentFloor (" + elevator.currentFloor() + ")");
                            console.log("adding to end of queue");
                            elevator.goToFloor(floorNum);
                            return;
                        }
                        // Push floors in the queue that are on the way to this floor
                        var newQueue = new Array();
                        var currentFloor = elevator.currentFloor();
                        if (floorNum > currentFloor) {
                            // Going up!
                            for (var j = currentFloor; j < floorNum; j++) {
                                if (elevator.destinationQueue.indexOf(j) != -1) {
                                    console.log("Stopping at " + j + " on the way to " + floorNum);
                                    newQueue.push(j);
                                }
                            }
                        } else if (floorNum < currentFloor) {
                            // Going down!
                            for (var j = currentFloor; j > floorNum; j--) {
                                if (elevator.destinationQueue.indexOf(j) != -1) {
                                    console.log("Stopping at " + j + " on the way to " + floorNum);
                                    newQueue.push(j);
                                }
                            }
                        }
                        // Push floor
                        newQueue.push(floorNum);
                        // Push remaining queue items
                        for (var j = 0; j < elevator.destinationQueue.length; j++) {
                            if (newQueue.indexOf(elevator.destinationQueue[j]) == -1) {
                                newQueue.push(elevator.destinationQueue[j]);
                            }
                        }
                        // And set the queue
                        elevator.destinationQueue = newQueue;
                        elevator.checkDestinationQueue();
                    })(elevator, floorNum);
                    console.log("elevator.destinationQueue: " + elevator.destinationQueue);
                });
            })(elevators[i]);
        }
        function chooseElevator(goToFloorNum) {
            // See which is already going in that direction
            var minLoadFactor = 1.0;
            var currentMinLoadElevator;
            for (var i = 0; i < elevators.length; i++) {
                var elevator = elevators[i];
                if (elevator.loadFactor() == 1) {
                    elevator.log("Load factor is 1!");
                    continue;
                }
                if (elevator.destinationQueue.indexOf(goToFloorNum) != -1) {
                    elevator.log("floorNum is already in my queue, done");
                    return elevator;
                }
                if (goToFloorNum > elevator.currentFloor() && elevator.goingUpIndicator()) {
                    elevator.log("Already going up, using me");
                    return elevator;
                }
                if (goToFloorNum < elevator.currentFloor() && elevator.goingDownIndicator()) {
                    elevator.log("Already going down, using me");
                    return elevator;
                }
                if (elevator.loadFactor() < minLoadFactor) {
                    currentMinLoadElevator = elevator;
                    minLoadFactor = elevator.loadFactor();
                }
            }
            if (currentMinLoadElevator) {
                currentMinLoadElevator.log("Using min load elevator with load " + minLoadFactor);
                return currentMinLoadElevator;
            }
            // Other ideas:
            // - Check for shortest queue
            // - Check for closest to elevator's current floor
            // - Check for least full        
            console.log("Using a random elevator");
            var elevatorNum = Math.floor(Math.random() * elevators.length);
            return elevators[elevatorNum];
        }
        for (var i=0; i<floors.length; i++) {
            (function(floor){
                var floorNum = floor.floorNum();
                floor.log = function(text) {
                    console.log("Floor[" + floorNum + "]" + text);
                }
                floor.on("up_button_pressed", function() {
                    var elevator = chooseElevator(floorNum);
                    elevator.log("up_button_pressed from floor " + floorNum + " - using me");
                    if (elevator.destinationQueue.indexOf(floorNum) == -1) {
                        elevator.goToFloor(floorNum);
                    } else {
                        elevator.log("floor " + floorNum + " is already in destinationQueue!");
                    }
                    console.log("elevator.destinationQueue: " + elevator.destinationQueue);
                });
                floor.on("down_button_pressed", function() {
                    var elevator = chooseElevator(floorNum);
                    elevator.log("down_button_pressed from floor " + floorNum + " - using me");
                    if (elevator.destinationQueue.indexOf(floorNum) == -1) {
                        elevator.goToFloor(floorNum);
                    } else {
                        elevator.log("floor " + floorNum + " is already in destinationQueue!");
                    }
                    elevator.goToFloor(floorNum);
                    elevator.log("elevator.destinationQueue: " + elevator.destinationQueue);
                });
            })(floors[i]);
        }
    },
    update: function(dt, elevators, floors) {
        // We normally don't need to do anything here
    }
}