Workshop › Pac-Man-style Maze Chase › Step 15 of 42

Eat the pellets

What we are doing

When a step ends, the mover arrives on a tile. arrive removes the pellet there (10 points) or the power pellet (50 points). delete tells whether something was removed, so a tile scores only the first time.

```js
let score
let level

  score = 0
  level = 1

  e.row += e.dir[1]
  arrive(e)
}

function arrive(e) {
  if (e !== player) return
  const here = key(player.col, player.row)
  if (pellets.delete(here)) score += 10
  if (powers.delete(here)) score += 50
}
```

What it means

advance calls arrive right after the tile changes.
Only the player eats: ghosts will use advance too.
Set.delete returns true if the key was there (and removes it), false if not: eating and "was there a pellet?" in one call.

Your turn

Under let player write let score and let level; in reset, set them to 0 and 1 above fillPellets().
At the end of advance call arrive(e), and under advance write arrive.

Skills: Game states, Collision detection

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