Workshop › Connect Four › Step 36 of 38

Counting wins

What we are doing

The fun is in the series: you against the computer, game after game. Both sides' wins are kept in one object and saved in localStorage after every win, as JSON text, so they survive a page reload.

```js
let wins = JSON.parse(localStorage.getItem('connect4-wins') || '{"1":0,"2":0}')

    wins[who] += 1
    localStorage.setItem('connect4-wins', JSON.stringify(wins))
```

What it means

• getItem reads the saved text, or null the first time; || '{"1":0,"2":0}' falls back to a zero score.
• JSON.parse turns the text into an object, JSON.stringify an object into text.
• On a win, the winner's count goes up by one and the whole object is saved.

Your turn

1. Under let thinking write the wins line.
2. In land, under line = four, write the two lines.

Skills: Game states

← You and the computer Show the score →

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