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Simplify the example used for case objects. #2172

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Sep 16, 2021
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Simplify the example used for case objects. #2172

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0d7ba8b
Simplify the example used for case objects.
vlulla Aug 31, 2021
af5e31f
Update _overviews/scala3-book/domain-modeling-tools.md
SethTisue Sep 10, 2021
ad51312
Update _overviews/scala3-book/domain-modeling-tools.md
SethTisue Sep 10, 2021
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12 changes: 6 additions & 6 deletions _overviews/scala3-book/domain-modeling-tools.md
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Expand Up @@ -685,14 +685,14 @@ case class DecreaseVolume(amount: Int) extends Message
case object StopPlaying extends Message
```

Then in other parts of your code you can write methods like this, which use pattern matching to handle the incoming message:
Then in other parts of your code, you can write methods like this, which use pattern matching to handle the incoming message (assuming the methods `playSong`, `changeVolume`, and `stopPlayingSong` are defined somewhere else):

```scala
def handleMessages(msg: Message) = message match
case PlaySong(name) => playSong(name)
case IncreaseVolume(amt) => changeVolume(amt)
case DecreaseVolume(amt) => changeVolume(-amt)
case StopPlaying => stopPlayingMusic
def handleMessages(message: Message): Unit = message match
case PlaySong(name) => playSong(name)
case IncreaseVolume(amount) => changeVolume(amount)
case DecreaseVolume(amount) => changeVolume(-amount)
case StopPlaying => stopPlayingSong()
```
[ref-enums]: {{ site.scala3ref }}/enums/enums.html
[adts]: {% link _overviews/scala3-book/types-adts-gadts.md %}
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