Elevator Saga: http://play.elevatorsaga.com

challenges-1-to-5.js

{
    init: function(elevators, floors) {

        var waiting = [];

        elevators.forEach(function (elevator) {

          elevator.on("idle", function() {
              var i = waiting.length;
              while (i-- > 0) {
                  if (waiting[i] > 0) {
                      waiting[i] = 0;
                      this.goToFloor(i);
                      return;
                  }
              }
              this.stop();
          });

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

        floors.forEach(function(floor, floorNum) {

          waiting[floorNum] = 0;

          floor.on("up_button_pressed", function() {
              waiting[this.floorNum()] += 1;
          });
          floor.on("down_button_pressed", function() {
              waiting[this.floorNum()] += 1;
          });
        });
    },
    update: function(dt, elevators, floors) {
        // We normally don't need to do anything here
    }
}