Snake 🐍

The classic snake game, now in terminal, developed in TypeScript. Typesnake?.

How this piece of code works?

Initialization

When an instance of the Snake class is created, several properties are initialized. The snake starts at position [10, 10] on a 20x20 board, the apple is placed at a random position, and the snake starts moving to the left. The time interval between each move of the snake is 1000 milliseconds by default, but can be modified.

constructor(interval?: number)
{
  this.interval = interval ?? 1000
}

Keyboard Events

In the initialize() method, keyboard events are set up to control the direction of the snake. When a key is pressed, the direction of the snake is changed unless it is the opposite direction to the current one (to prevent the snake from moving backwards onto itself).

process.stdin.on('keypress', (str, key) =>
{
  switch (key.name)
  {
    case 'up':
      if (this.direction[0] !== 1) this.direction = [-1, 0]
      break
    ...
  }
})

Snake Movement

Every second (or the specified time interval), the snake moves in the current direction. If the snake bites itself, the game ends. If the snake eats an apple, a new apple is generated at a random position and the snake grows in length. If it doesn’t eat an apple, the snake moves without growing.

setInterval(() =>
{
  ...
  if (head[0] === this.apple[0] && head[1] === this.apple[1]) this.apple = [Math.floor(Math.random() * 20), Math.floor(Math.random() * 20)]
  else this.snake.pop()
  ...
}, this.interval)

Drawing the Board

After each move, the board is redrawn with the snake and the apple in their new positions.

draw()
{
  console.clear()
  ...
  console.log(row)
}

Starting the Game

Finally, an instance of the Snake class is created and the initialize() method is called to start the game.

const snake = new Snake(1000)
snake.initialize()

ready, did you expect more? no, that's all. 🗿