prevented crash

sketches/snake.js

@@ -101,6 +101,28 @@ function dontMoveBackwards(lastSnakeX, lastSnakeY, currentSnakeX, currentSnakeY,
 	}
 }
 
+function restartGame(){
+
+	for (let i = 0; i < grid.length; i++) {
+		for (let j = 0; j < grid[0].length; j++) {
+
+			if (grid[i][j] == 2 || grid[i][j] == 1) {
+				grid[i][j] = 0;
+			}
+		}
+	}
+
+	snake = [];
+
+	summonSnake();
+
+	for (let i = 0; i < appleAmount; i++) {
+		summonApple();
+	}
+
+	alive = true;
+}
+
 function runSnake(){
 	let x = snake[0][0];
 	let y = snake[0][1];
@@ -156,9 +178,23 @@ function drawSnakeOnGrid(){
 			}
 		}
 	}
+
 	for (let i = 0; i < snake.length; i++) {
+
 		let x = snake[i][0];
 		let y = snake[i][1];
+
+		// prevent crash
+		if (
+			x < 0 ||
+			y < 0 ||
+			x >= grid.length ||
+			y >= grid[0].length
+		){
+			alive = false;
+			return;
+		}
+
 		grid[x][y] = 2;
 	}
 }
@@ -180,24 +216,36 @@ function drawGrid() {
 
 function draw() {
 	background(255);
-	if (alive = false){
+
+	if (alive == false){
+		restartGame();
 		return;
 	}
+
 	runSnake();
 	drawGrid();
+
 	fill(0, 0, 0);
 	textSize(_textSize);
+
 	text("₴ " + eatenApples, gridColumns * gridSize + gridSize + _textSize*3, _textSize * 1);
 	text("Apples: " + appleAmount, gridColumns * gridSize + gridSize, _textSize * 2);
+
 	buttonAddMoreApples.html("Add more apples ₴ " + AddMoreApplesPrice);
 	buttonAddMoreApples.position(gridColumns * gridSize + gridSize + _textSize*6, _textSize * 1.5);
+
 	text("AI: " + AItype, gridColumns * gridSize + gridSize, _textSize * 3);
+
 	buttonUpgradeAI.html("Upgrade AI ₴ " + UpgradeAIPrice);
 	buttonUpgradeAI.position(gridColumns * gridSize + gridSize + _textSize*6, _textSize * 2.5);
+
 	text("Coloums: " + gridColumns, gridColumns * gridSize + gridSize, _textSize * 4);
+
 	buttonAddColoums.html("Add coloums ₴ " + AddColoumsPrice);
 	buttonAddColoums.position(gridColumns * gridSize + gridSize + _textSize*6, _textSize * 3.5);
+
 	text("Rows: " + gridRows, gridColumns * gridSize + gridSize, _textSize * 5);
+
 	buttonAddRows.html("Add rows ₴ " + AddRowsPrice);
 	buttonAddRows.position(gridColumns * gridSize + gridSize + _textSize*6, _textSize * 4.5);
 }