Workshop › Angry Birds-style Slingshot › Step 39 of 47

Won or lost

What we are doing

When a shot has settled, the game decides: no pigs left means the level is won, and every unused bird is worth 1000; pigs left and no birds means lost; otherwise, the next bird. Once it is over, the physics stops.

```js
let state // 'aiming', 'flying', 'won' or 'lost'

function update() {
  if (state !== 'flying' && state !== 'aiming') return
  ...
  if (pigs().length === 0) {
    score += birdsLeft * 1000 // unused birds are worth a lot
    state = 'won'
  } else if (birdsLeft === 0) state = 'lost'
  else state = 'aiming'
}
```

What it means

state can now be two more words.
The first line of update stops everything once the game is won or lost.
pigs().length === 0 asks whether any pig is left; the if ... else if ... else picks one of three outcomes.

Your turn

Change the let state comment.
In update, write the new first line.
At the end of update, replace state = 'aiming' with the if ... else if ... else.

Skills: Game states

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