Workshop › Conway's Game of Life › Step 17 of 32

Let it live

What we are doing

Every turn of the loop first updates the world, then draws it. One line, and the world comes alive.

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

What it means

• update() runs every frame before draw(): the world changes first, then the new picture is painted.

Your turn

In loop, write update() on the line above draw().

Skills: The game loop

← A generation every few frames Running or not →

All steps

1. The board
2. Measure the grid
3. One living cell
4. A function that draws
5. The world in memory
6. Draw every living cell
7. A random soup
8. Count the neighbours
9. Four rules
10. Draw again and again
11. Next generation with N
12. Count the generations
13. Show the generation
14. A world without edges
15. Count the living
16. A generation every few frames
17. Let it live
18. Running or not
19. One place for the buttons
20. Space to play, N to step
21. Clear and shuffle
22. Where is the pointer?
23. Which cell?
24. Click a cell
25. Paint or erase?
26. Drag to paint
27. Patterns from text
28. The glider gun
29. Fire the gun
30. Buttons on the screen
31. Tap the buttons
32. Build it yourself: a world at rest