Add no walls option

sources/js/Game.js

@@ -2,6 +2,10 @@ import {Tile, tiles} from "./Tile.js"
 import {Snake, directions} from "./Snake.js";
 
 
+function mod_floor(a, n) {
+    return ((a % n) + n) % n;
+}
+
 export class Game {
     /**
      * Generate a new game of Snake
@@ -150,17 +154,22 @@ export class Game {
     /**
      * Update the snake on the world and check for collision
      */
+
     updateSnake() {
-        for (const [x, y] of this.snake.body)
+        for (const i in this.snake.body) {
+            const [x, y] = this.snake.body[i];
             if (!(x in this.world) || !(y in this.world[x]))
-                throw new GameOver();
+                if (this.walls)
+                    throw new GameOver();
+                else
+                    this.snake.body[i] = [mod_floor(x, this.size[0]), mod_floor(y, this.size[1])];
             else {
                 const t = this.world[x][y];
                 if (t.type === tiles.APPLE) {
                     this.snake.eat();
                     this.appleGenerator();
                     this.score++;
-                    if (!(this.score%5) && this.snakeSpeed > 50) {
+                    if (!(this.score % 5) && this.snakeSpeed > 50) {
                         this.snakeSpeed -= 10;
                     }
                     if (this.onEat && typeof this.onEat === "function")
@@ -168,6 +177,7 @@ export class Game {
                 }
                 t.type = tiles.SNAKE;
             }
+        }
     }
 
     /**
@@ -219,7 +229,7 @@ export class Game {
      * @param {int} appleSpeed
      * @param {int} lives
      */
-    load({size = [15, 15], direction = directions.RIGHT, snakeSpeed = 500, lives = 3} = {}) {
+    load({size = [15, 15], direction = directions.RIGHT, snakeSpeed = 500, lives = 3, walls = true} = {}) {
         if (size && Array.isArray(size) && size.length === 2 && size.filter(s => typeof s === "number" && s > 0 && s % 1 === 0).length === size.length)
             this.size = size;
         else
@@ -239,6 +249,9 @@ export class Game {
             this.lives = lives;
         else
             throw new InvalidGameOption("lives");
+
+        if (walls && typeof walls === "boolean")
+            this.walls = walls
     }
 }
 

sources/levels.json

@@ -1,5 +1,21 @@
 {
   "Level 1": {
+    "snakeSpeed": 300
+  },
+  "Level 2": {
+    "snakeSpeed": 250
+  },
+  "Level 3": {
+    "snakeSpeed": 200
+  },
+  "Level 4": {
+    "snakeSpeed": 150
+  },
+  "Level 5": {
     "snakeSpeed": 100
+  },
+  "No walls": {
+    "snakeSpeed": 100,
+    "walls": false
   }
 }