added fire and a stub for level 5

src/js/snek.js

@@ -1,4 +1,4 @@
-const [EMPTY, FOOD, WALL, HOLE, HOLE_S, SNAKE]=Array(6).keys();
+const [EMPTY, FOOD, WALL, FIRE, HOLE, HOLE_S, SNAKE]=Array(7).keys();
 
 class SnekGame {
 	constructor(settings, canvas, rules) {
@@ -19,6 +19,7 @@ class SnekGame {
 							case 'f': return FOOD;
 							case 'w': return WALL;
 							case 'o': return HOLE;
+							case 'i': return FIRE;
 						}
 					})();
 				}
@@ -53,6 +54,9 @@ class SnekGame {
 			// add the holes
 			if(settings.holes) settings.holes.forEach(([x, y]) => this.world[x][y]=HOLE);
 
+			// add the fires
+			if(settings.fires) settings.fires.forEach(([x, y]) => this.world[x][y]=FIRE);
+
 			// add the food
 			settings.food.forEach(([x, y]) => this.world[x][y]=FOOD);
 			this.fruits=[...settings.food];
@@ -122,7 +126,7 @@ class SnekGame {
 		// draw our walls
 		const wall=assets.get('wall');
 		const hole=assets.get('hole');
-
+		const fire=assets.get('fire');
 		const putTile=(x, y, tile) => this.ctx.drawImage(
 			tile,
 			offsetX+cellSize*x,
@@ -149,6 +153,10 @@ class SnekGame {
 						putTile(x, y, wall);
 						break;
 
+					case FIRE:
+						putTile(x, y, fire[Math.floor(Date.now()/1000*60)%60]);
+						break;
+
 					case HOLE: 
 					case HOLE_S: {
 						putTile(x, y, hole.base);
@@ -253,6 +261,7 @@ class SnekGame {
 		switch(this.world[head[0]][head[1]]) {
 			// you hit, you die
 			case WALL:
+			case FIRE:
 			case SNAKE:
 			case HOLE_S:
 				return this.die();