Workshop › Tetris-style Blocks › Step 18 of 32

Land and lock

What we are doing

When the piece cannot fall any more it locks: its blocks are copied into the board, and a new piece appears.

```js
function lock() {
  piece.shape.forEach((cells, r) => {
    cells.forEach((value, c) => {
      if (value) board[piece.y + r][piece.x + c] = value
    })
  })
  spawn()
}

function softDrop() {
  if (!tryMove(0, 1)) lock()
}

    softDrop()
```

What it means

• lock walks the matrix like drawShape, but writes each filled cell's number into the board instead of drawing it.
• softDrop tries to move one row down; if that fails (!), the piece has landed and is locked.
• The loop now calls softDrop().

Your turn

1. Under tryRotate write lock and softDrop.
2. In loop, replace tryMove(0, 1) with softDrop().

Skills: Game states, Arrays and objects

← A random piece at the top One function starts a game →

All steps

1. The well
2. The board as rows of numbers
3. Draw one cell
4. Draw the whole board
5. The number is the color
6. A piece is a small grid
7. A list of shapes
8. All seven pieces
9. Does it fit inside the well?
10. Blocks are in the way
11. Try, then move
12. Move with the arrows
13. Turn a matrix
14. Turn with Up
15. Wall kicks
16. Falling by itself
17. A random piece at the top
18. Land and lock
19. One function starts a game
20. When the pile reaches the top
21. Game Over on screen
22. Play again
23. Clear full rows
24. Points for lines
25. The side panel
26. Levels
27. Faster every level
28. A fair bag of pieces
29. The next piece
30. Drop it
31. The ghost piece
32. Build it yourself: hold a piece