Workshop › Conway's Game of Life › Step 29 of 32

Fire the gun

What we are doing

A 'Gun' button clears the world and stamps the gun near the top left; the G key presses it.

```js
  else if (button === 'Clear') clear()
  else if (button === 'Gun') {
    clear()
    stamp(GUN, 4, 4)
  }
}

  const keys = { ' ': 'Play', n: 'Step', r: 'Random', c: 'Clear', g: 'Gun' }
```

What it means

• 'Gun' first clears (empty and stopped), then stamps GUN with its top left corner at row 4, column 4.
• g: 'Gun' in the table makes the G key press it.

Your turn

1. In press, under the 'Clear' line, add the 'Gun' case (four lines).
2. Add g: 'Gun' to the key table.

Skills: Keyboard and mouse input

← The glider gun Buttons on the screen →

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