http://play.elevatorsaga.com/ - getting there

gistfile1.txt

{
  init: function(elevators, floors) {
    var getByFloor = function (value) {
      var result = floorsWaiting.filter(function(o){return o.floorNum == value;} );
      return result? result[0] : null; // or undefined
    }
    var getElevatorById = function (arr, value) {
      var result = arr.filter(function(o){return o.iden == value;} );
      return result? result[0] : null; // or undefined
    }
    
    var floorsWaiting = []
    var floorsVisited = []
    
    var moveFloorToFront = function(floorNum) {
        floorsVisited = floorsVisited.filter(function(o){return o != floorNum;} );
        floorsVisited.unshift(floorNum)
    }
    
    var floorHasHigherPriority = function(newFloor, oldFloor) {
      return floorsVisited.indexOf(newFloor) > floorsVisited.indexOf(oldFloor)
    }
    
    var sendElevatorToAFloor = function() {
      var evToUse
      elevators.forEach(function (elevator, index) { 
        if (elevator.idleInterval != null) {
          evToUse = elevator
        }
      });
      if (evToUse == null) {
        evToUse = elevators[Math.floor(Math.random()*elevators.length)];
      }
      evToUse.findFloorToGoTo()
    }
    
    elevators.forEach(function (elevator, index) { 
      elevator.iden = index
      elevator.findFloorToGoTo = function() {
        var floorToGoTo
        floorsWaiting.forEach(function (floorWaiting, index) {
          if (getElevatorById(floorWaiting.vads, elevator.iden).inside == true) {
            floorToGoTo = floorWaiting.floorNum
          } else {
            if (floorWaiting.up == true) {
              if (floorToGoTo == null) { floorToGoTo = floorWaiting.floorNum;}
            }
            if (floorWaiting.down == true) {
              if (!floorToGoTo == null) { floorToGoTo = floorWaiting.floorNum;}
            }
          }
        });
        if (floorToGoTo != null && (elevator.destinationQueue == null || elevator.destinationQueue.length == 0)) {
          elevator.destinationQueue = [floorToGoTo]
          elevator.checkDestinationQueue()
          if (elevator.idleInterval != null) {
            clearInterval(elevator.idleInterval)
            elevator.idleInterval = null
          }
        }
        return floorToGoTo
      }
      
      elevator.on("idle", function() {
        if (elevator.findFloorToGoTo() == null) {
          elevator.idleInterval = setInterval(elevator.findFloorToGoTo, 100);
        }
      });
      
      elevator.on("stopped_at_floor ", function(floorNum) {
        getElevatorById(getByFloor(floorNum).vads, elevator.iden).inside = false
        getByFloor(floorNum).up = false
        getByFloor(floorNum).down = false
        moveFloorToFront(floorNum)
      });
      
      elevator.on("floor_button_pressed", function(floorNum) {
        getElevatorById(getByFloor(floorNum).vads, elevator.iden).inside = true
      });
      
      elevator.on("passing_floor", function(floorNum, direction) {
        //console.log(elevator.loadFactor())
        var floor = getByFloor(floorNum)
        if (floor.inside == true) {
          elevator.destinationQueue.unshift(floorNum)
          elevator.checkDestinationQueue()
        } else {
          if (elevator.loadFactor() > 0.65) {
            return
          }
          if (floor.up == true && direction == "up") {
            if (floorNum != elevator.destinationQueue[0]) {
              elevator.destinationQueue.unshift(floorNum)
              elevator.checkDestinationQueue()
            }
          }
          if (floor.down == true && direction == "down") {
            if (floorNum != null && floorNum != elevator.destinationQueue[0]) {
              elevator.destinationQueue.unshift(floorNum)
              elevator.checkDestinationQueue()
            }
          }
        }
      });
    });
    
    floors.forEach(function (floor, index) { 
      // init each floor
      var floorObj = {
        floorNum: floor.floorNum(),
        up: false,
        down: false,
        vads: []
      }
      elevators.forEach(function (elevator, index) { 
        floorObj.vads.push({
          iden: elevator.iden,
          inside: false
        })
      });
      
      floorsWaiting.push(floorObj);
      
      floor.on("up_button_pressed", function() {
        getByFloor(floor.floorNum()).up = true
        sendElevatorToAFloor()
      });
      floor.on("down_button_pressed", function() {
        getByFloor(floor.floorNum()).down = true
        sendElevatorToAFloor()
      });
    });
  },
  update: function(dt, elevators, floors) {
    // We normally don't need to do anything here
  }
}