Workshop › Snake › Step 7 of 28

A function that moves

What we are doing

Every game has two jobs: update (change the state) and draw (show it). update moves the head one cell to the right.

```js
function update() {
  head.x += 1
}
```

What it means

• head.x += 1 means "add 1 to head.x": column 5 becomes 6.
• Defining update does not call it, so nothing moves yet.

Your turn

Write update above function draw() {, with an empty line between them.

Skills: Game states, Functions

← A function that draws The game loop →

All steps

1. Find the canvas
2. Get the pen
3. Paint the board
4. Think in cells
5. Keep the position in a variable
6. A function that draws
7. A function that moves
8. The game loop
9. Slow it down
10. A direction to move in
11. Steer with the arrow keys
12. A body made of a list
13. Move the whole body
14. Pick a spot for the food
15. Draw the food
16. Eat and grow
17. Never put food on the snake
18. A table of turns
19. No U-turns
20. Crash into the walls
21. Crash into yourself
22. The game over message
23. Show the score
24. One function that starts a game
25. Play again with Space
26. Remember the best score
27. Speed up as you grow
28. Build it yourself: through the walls