Return current state from reducer

[moffpage]

Should reducer return a new state in every situation? Example:
I have a model:

data class Model(
    val state: State
)

and I have a result

sealed class Result {
    data class ModelDidChange(val newState: State) : Result()
    data class ModelChangeFailed(val error: StateChangeError) : Result()
}

object ReducerImpl : Reducer<State, Result> {
override fun State.reduce(result: Result): State = when (result) {
is Result.AppealStatusDidChange -> State(appealStatus = result.newStatus)
is Result.AppealStatusChangedFailed -> TODO() // return old state and handle error
}
}

What should I return in the second case? Should I return the same copy? How should I do that, if that's the case? Cause I have no access to Store object in the Reducer.

[arkivanov]

You have the current state in the Reducer as receiver parameter, so you can use copy (to create a shallow copy) or this.

[moffpage]

Yeah… For some reason (it was probably late) I was dumb and something didn’t work. Anyway, thanks for help!

…

On 6 May 2021, at 2:39 PM, Arkadii Ivanov ***@***.***> wrote:  You have the current state in the Reducer as receiver parameter, so you can use copy (to create a shallow copy) or this. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.