Hi Guys ! why my simple state handling isn't worki...

# compose

[Mahdi Safarmohammadloo]

Hi Guys ! why my simple state handling isn't working ?

class Core {
    val texts:MutableList<String> = mutableListOf("Salam !","Hello World !")
    fun add (text:String):Core{
        texts.add(text)
        return this
    }
}
fun main() = Window {
    var core by remember { mutableStateOf(Core()) }
    MaterialTheme {
        Button(onClick = {
            core = core.add("salam ! salam !")
        }) {
            Column {
                core.texts.map {
                    Text (it)
                }
            } } } 
}

[Filip Wiesner]

Because you are not changing the state, only mutating it's property

[Filip Wiesner]

Change the texts property to

val texts:MutableList<String> = mutableStateListOf("Salam !","Hello World !")

And the core val to

var core = remember { Core() }

[Colton Idle]

This is still one of the hardest things for me to remember. Wish there was like a lint rule or something that prevented me from using mutable objects with compose.

[Mahdi Safarmohammadloo]

@Filip WiesnerThanks so much ! so as i thought we can have only String or (int,Boolean) as a State , not a class or data class.

[Filip Wiesner]

State can be anything 😉
It clicked for me when I stopped thinking about remember { mutableStateOf() } as a one thing and actually started using remember {} alone. One of the first things you learn when starting with Compose is using remember with mutableState together and it was hard for me to separate it after you learn what remember really does. Hope it makes sense... 😅

[Mahdi Safarmohammadloo]

@Filip Wiesner Thanks !!! You saved my day !

[Filip Wiesner]

No worries, good luck coding 🎉