improve comments in game manager

js/game_manager.js

@@ -26,6 +26,7 @@ GameManager.prototype.keepPlaying = function () {
   this.actuator.continue();
 };
 
+// Return true if the game is lost, or has won and the user hasn't kept playing
 GameManager.prototype.isGameTerminated = function () {
   if (this.over || (this.won && !this.keepPlaying)) {
     return true;
@@ -38,6 +39,7 @@ GameManager.prototype.isGameTerminated = function () {
 GameManager.prototype.setup = function () {
   var previousState = this.storageManager.getGameState();
 
+  // Reload the game from a previous game if present
   if (previousState) {
     this.grid        = new Grid(previousState.grid.size,
                                 previousState.grid.cells); // Reload grid
@@ -100,6 +102,7 @@ GameManager.prototype.actuate = function () {
 
 };
 
+// Represent the current game as an object
 GameManager.prototype.serialize = function () {
   return {
     grid:        this.grid.serialize(),
@@ -195,10 +198,10 @@ GameManager.prototype.move = function (direction) {
 GameManager.prototype.getVector = function (direction) {
   // Vectors representing tile movement
   var map = {
-    0: { x: 0,  y: -1 }, // up
-    1: { x: 1,  y: 0 },  // right
-    2: { x: 0,  y: 1 },  // down
-    3: { x: -1, y: 0 }   // left
+    0: { x: 0,  y: -1 }, // Up
+    1: { x: 1,  y: 0 },  // Right
+    2: { x: 0,  y: 1 },  // Down
+    3: { x: -1, y: 0 }   // Left
   };
 
   return map[direction];