Add 'level4.md'
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## v0.1
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There was an error in elevator events. Replacing `elevator` with `this` inside event declaration solves the problem.
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Works with previous levels also.
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```js
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{
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init: function(elevators, floors) {
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console.clear();
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const DIR_UP = 2;
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const DIR_DOWN = 1;
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const DIR_STOP = 0;
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const MAX_FLOOR = floors.length - 1;
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for (var i = 0; i < elevators.length; i++) {
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elevators[i].name = "Elevator " + i;
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console.log(elevators[i].name);
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}
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var elev_state = [];
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// Initialize elevator states
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if (elev_state == []) {
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for (var i = 0; i < elevators.length; i++) {
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elev_state.push(DIR_STOP);
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}
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}
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// HELPER functions
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// Command elevator to move to floor
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sendElevator = function(floor, dir) {
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// debug
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for (var i = 0; i < elevators.length; i++) {
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var elevator = elevators[i];
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//console.log("Elevator " + elev + " pressed floors:");
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//console.log(elevator.getPressedFloors());
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}
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// At first trying to find closest empty elevator and send it
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if (!getFreeElevator(floor)) {
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// We didn't found free elevator
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var less_loaded = getLessLoaded()[0];
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if (!less_loaded.destinationQueue.includes(floor)) {
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//less_loaded.destinationQueue.push(floor);
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//less_loaded.checkDestinationQueue();
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less_loaded.goToFloor(floor);
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// debug
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console.log("Added floor " + floor + " to less loaded elevator");
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//console.log("Elevator queue: ");
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//console.log(less_loaded.destinationQueue);
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}
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}
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}
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// Get distance of elevator from floor
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getDistance = function(elevator, floor) {
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return Math.abs(elevator.currentFloor() - floor);
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}
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// Found free elevator closer to required floor and send it there
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getFreeElevator = function(floorRequired = 0) {
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// closest empty elevator
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var best = null;
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// get zero-loaded elevators
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var zero = [];
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for (var elev = 0; elev < elevators.length; elev++) {
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var elevator = elevators[elev];
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if (elevator.loadFactor() == 0) {
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zero.push(elevator);
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}
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}
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// Found closer elevator from those who had 0 load
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for (var elev = 0; elev < zero.length; elev++) {
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var elevator = zero[elev];
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if (best == null) {
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best = elevator;
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}
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if (getDistance(elevator, floorRequired) < getDistance(best, floorRequired)) {
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best = elevator;
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}
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}
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if (best != null) {
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// debug
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console.log("Empty elevator moving to floor " + floorRequired);
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// If we found one command to move to requested floor
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best.goToFloor(floorRequired);
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return true;
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}
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return false;
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}
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// Get less loaded elevator
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getLessLoaded = function() {
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return elevators.sort( (a,b) => (a.destinationQueue.length - b.destinationQueue.length) );
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}
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// ELEVATOR events
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for (var elev = 0; elev < elevators.length; elev++) {
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var elevator = elevators[elev];
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// Elevator is not doing anything
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elevator.on("idle", function() {
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// When idle move to 0 floor
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// elevator.goToFloor(0);
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});
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// Passenger requested floor
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elevator.on("floor_button_pressed", function(floor) {
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// debug
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//console.log("Elevator " + elevator.name + " pressed floors:");
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//console.log(elevator.getPressedFloors());
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console.log(this.name + ": pressed floor " + floor);
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//elevator.goToFloor(floor);
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if (!this.destinationQueue.includes(floor)) {
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//elevator.destinationQueue.push(floor);
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//elevator.checkDestinationQueue();
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this.goToFloor(floor);
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}
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});
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// Stopped on a particulat floor
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elevator.on("stopped_at_floor", function(floorNum) {
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// debug
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// console.log("Elevator " + elev + " pressed floors:");
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// console.log(elevator.getPressedFloors());
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// console.log("Elevator stopped at floor: " + floorNum);
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elev_state[elev] = DIR_STOP;
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// Change direction arrows lights
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var state_up, state_down = false;
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switch (floorNum) {
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case 0:
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state_up = true;
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state_down = false;
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break;
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case MAX_FLOOR:
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state_up = false;
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state_down = true;
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break;
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default:
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state_up = true;
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state_down = true;
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break;
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}
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this.goingUpIndicator(state_up);
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this.goingDownIndicator(state_down);
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});
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// Passing floor
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elevator.on("passing_floor", function(floor, dir) {
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switch (dir) {
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case "up": elev_state[elev] = DIR_UP;
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break;
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case "down": elev_state[elev] = DIR_DOWN;
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break;
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}
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});
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}
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// FLOOR events
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for (var fl = 0; fl < floors.length; fl++) {
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var floor = floors[fl];
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// DOWN button pressed on a floor
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floor.on("down_button_pressed", function() {
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// debug
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//console.log("Button DOWN pressed on a floor " + this.floorNum());
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sendElevator(this.floorNum(), DIR_DOWN);
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});
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// UP button pressed on a floor
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floor.on("up_button_pressed", function() {
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// debug
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//console.log("Button UP pressed on a floor " + this.floorNum());
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sendElevator(this.floorNum(), DIR_UP);
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});
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}
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},
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update: function(dt, elevators, floors) {
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// We normally don't need to do anything here
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}
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}
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```
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