Workshop › Memory › Step 17 of 25

Pair or no pair

What we are doing

When the second card is open: the same fruit is a pair, both are matched and stay open. Different fruits must turn back over, but not at once, or the player never sees the second card. setTimeout waits 800 ms.

```js
  if (opened.length < 2) return

  const [a, b] = opened
  if (a.symbol === b.symbol) {
    a.matched = true
    b.matched = true
    opened = []
  } else {
    // Give the player time to see the second card before hiding both again.
    setTimeout(() => {
      a.faceUp = false
      b.faceUp = false
      opened = []
    }, 800)
  }
}
```

What it means

With only one card open, stop here.
const [a, b] = opened names the two open cards.
A pair is marked matched and opened is emptied for the next turn.
Otherwise setTimeout turns both back over and empties opened 800 ms later. Until then opened holds two cards, so the rule from the last step keeps a third card closed.

Your turn

At the end of flip, under opened.push(card), write the new lines, above the function's last }.

Skills: Game states, The game loop

← Two cards at a time Count the moves →

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