Hi, I have a data class, is it correct to mark thi...

# compose

[Shakil Karim]

Hi, I have a data class, is it correct to mark this class as @Immutable and what will be the difference with @Stable Code in 🧵

[Shakil Karim]

sealed class BADGE(open val text: String)

data class GET(override val text: String) : BADGE(text)
data class OPEN(override val text: String) : BADGE(text)
data class COIN(override val text: String) : BADGE(text)

data class Pack(
    val pck: Long,
    val owner: Long,
    val title: String,
    val packNameMap: Map<String,String>,
    val type: String,
    val coins: Int,
    val emoji: String,
    val lang: String,
    val lections: List<Lection> = emptyList(),
    val badge: MutableState<BADGE?> = mutableStateOf(null)
)

[Chuck Jazdzewski [G]]

@Stable is preferred in this case as the type contains a mutable value, badge, so is not immutable.

The compiler treats both identically but using @Immutable is a promise that the value will never change. @Stable is a promise that the value is observable and if it does change listeners are notified. The latter is more appropriate here.

[Shakil Karim]

@Chuck Jazdzewski [G] Thanks 👍

[MBegemot]

What an awful name to name a thing that the value is observable and if it does change listeners are notified ... terrific IMHO