Snake Game: How To Code It and Build It for Free?


Saloni Singh

Snake game is a PC activity game, whose objective is to control a snake to move and gather food in a guide. In this paper we foster a controller in light of development rating functions thinking about perfection, space, and food.

Scores given by these functions are amassed by straight weighted aggregate, and the snake makes the move that prompts the most noteworthy score.

To find a bunch of good weight values, we apply a developmental calculation. We look at a few calculation variations of various hybrid and ecological choice administrators. Exploratory outcomes show that our plan strategy can create savvy controllers.


The HTML is fundamental.

  • We have a div of class score Display that will show our scores.
  • There’s a div of class matrix that will house the game (this will be a 10 by 10 framework)
  • The class button essentially contains a button for users playing the game on a telephone (we will computerize it with the console for work area user).
  • Also, the popup class will hold our replay button.

Presently we should add some styling with CSS.

snake game


In the CSS, the framework which is the gameboard has a set aspect and a presentation of flex. This permits the items (div) of this lattice to arrange in a level way as though they were inline components rather than the ordinary block show which they have.

The flex wrap property just moves the divs to the following line, keeping them from going past the set component of their parent component (framework).

We will be progressively making the game board contents from JS however we can give a width and level here (with the .framework div). I incorporated the remarks here to assist you with really seeing the divs, so over the long haul we will uncomment the code.

Presently we’re ready for the JavaScript.


The main thing we want to do is characterize our factors:

The variable width is precisely exact thing it is (the width of the framework, that is 10). Different factors will seem OK as we go on – yet in all honesty our snake is really an exhibit called currentSnake.

Presently we should begin with the functions:

There is an eventListener on the record object called DomContentLoaded and this occasion is shot quickly once the HTML content is stacked on our screen.

When this happens, we set an eventListener on the record to look for taps on the console (erring on this later). From that point forward, we need to make the gameBoard, begin the game, and watch out for taps on our replay button.

The CreateBoard Function

Like I said before, this is a 10 by 10 matrix, meaning we will require 100 divs. So from a higher place, we close the div popup and we circle to 100 each time we make a new div and add it to the network (gameboard).

This will quickly add a portion of the styling we made from a higher place (the .lattice div). You can uncomment the CSS styles and you will see the divs made (uncomment them back).

snake game

The StartGame Function

The startGame function initially gets all the divs (since we are making the divs at runtime, we can not get them at the highest point of the code).

Next we select a spot for our apple. We will do that underneath in the random apple function. The bearing alludes to where the snake is going – 1 for right, – 1 for left, etc.

Interval Time establishes the point in time it takes for the snake to move around, while currentSnake characterizes where precisely on the framework the snake will be (note that the snake is fundamentally several divs given a specific sort of variety).

To show our snake on the screen, we will circle over currentSnake with forEach. With each worth we get, we will use it with squares. Recollect that we got to the matrix divs with querySelectorAll, and we can then get to them like an exhibit utilizing numbers. For our situation, these are the upsides of currentSnake.

After this, we essentially add a setInterval call (with function move Outcome and a period of intervalTime, which we set above) to the variable span. This is so we can without much of a stretch call clearInterval on that factor.

The moveOutcome runs each 1000ms (1s) and fundamentally characterizes what happens when you move the snake.

snake game

The MoveSnake Function

The moveSnake function gets a contention called squares so we don’t have to get the .framework div again in this function.

The principal thing we really want to do is eliminate the last component of the current snake exhibit by means of pop (this is the tail and the main component is dependably the head). Fundamentally the snake pushes a stride ahead leaving the past position it was in. After this we essentially increase the value of the start of the exhibit with unShift.

How about we expect that our snake recently began moving and is looking to one side (that is, heading = 1). That course will be added to the current snakes head and the aggregate will be pushed as the new snakeHead.

The EatApple Function

The eatApple function is called from the moveSnake function each time the snake moves a stage.

It gets two contention squares, .framework div and tail (essentially the worth that was sprung up from the snake in moveOutcome). It then checks in the event that the following position our snake moves to contains an apple.

Assuming it does, it just adds that tail we sprung up back to the exhibit. This is because each time our snake eats an apple we need to build the length of the snake by one esteem – and what preferable way over to add the tail that was popped off when it moved?

snake game

Then we essentially select another situation for our apple with randomApple. After that we add a worth of one to our score and show it to the user, clear the timeInterval (so we can speed up the snake, that is the time every development happens) and afterward we essentially put the span in a difficult spot.


Recall from above we set an event listener for keyup. This function shoots following your hand presses and. leaves a vital on a console.

Presently each button on the console has a worth called keycode (numbers) which we have admittance to and told us which number was clicked. Essentially we will look for the bolt keys with their individual keycodes. With that we make shifts to the course, for instance – 1, 10, etc.

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