Workshop › Connect Four › Step 9 of 38

Draw every frame

What we are doing

draw() runs only once, so a change to the board would never show. A game loop draws again about 60 times a second: requestAnimationFrame(loop) asks the browser to run loop before the next screen refresh, and loop asks again.

```js
function loop() {
  draw()
  requestAnimationFrame(loop)
}

reset()
requestAnimationFrame(loop)
```

What it means

• loop draws one frame and books the next one.
• At the bottom, requestAnimationFrame(loop) replaces the single draw() and starts it all.

Your turn

1. Above reset() at the bottom write loop, followed by an empty line.
2. Replace the last line, draw(), with requestAnimationFrame(loop).

Skills: The game loop

← Discs in their colors Where does the disc land? →

All steps

1. A dark background
2. A drawing function
3. The blue board
4. One hole
5. A whole row
6. All 42 holes
7. The board in memory
8. Discs in their colors
9. Draw every frame
10. Where does the disc land?
11. Play a column
12. Taking turns
13. Click to play
14. The next disc
15. Whose turn?
16. Playing with the keyboard
17. Keys 1 to 7
18. A disc on its way
19. Gravity
20. Watch it fall
21. Inside the board?
22. Walking along a line
23. Four in a row?
24. We have a winner
25. Circle the four
26. Who won?
27. A draw
28. Play again
29. Try a move and take it back
30. Win, or block
31. Don't help the player
32. Prefer the middle
33. The computer's turn
34. Only on your turn
35. You and the computer
36. Counting wins
37. Show the score
38. Build it yourself: the loser starts