What’s the best way to convert a Map(or MutableMap...

# announcements

[Christian Sousa]

What’s the best way to convert a Map(or MutableMap) into a Data Class?

[LastExceed]

how about json?

[Christian Sousa]

It is something that I have defined, but I will need to have a data class in the end. I just used the MutableMap to be able to add dynamic values to it, but in the end I will need a Data class

[LastExceed]

if your types are dynamic, then what would that data class look like? also why are you trying to use dynamic types in a type safe language in the first place?

[Christian Sousa]

I have something like this:

data class StatusObject (
    val event: String
)

then I have

var myMutableMap: MutableMap<String, Any?> = mutableMapOf("event" to "default")

After that I receive an array of objects and will map through them to add them to myMutableMap

receivedArrayWithObjects.forEach {
            myMutableMap[it.header.name] = it.status.name
        }

But in the end, I need to return a StatusObject

I’m having this problem because I’m bringing code from Javascript to Kotlin

[Robert Jaros]

If you can annotate your data class @Serializable you can use kotlinx.serialization library for this.

[Christian Sousa]

Yeah, I can. And after that how can I use it?

[Robert Jaros]

https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/runtime_usage.md#useful-classes

[Robert Jaros]

note that Mapper class was renamed to Properties in serialization 0.20.0

[Christian Sousa]

Thanks!

[Robert Jaros]

also look at the issue I've created a few days ago https://github.com/Kotlin/kotlinx.serialization/issues/743

[Michael de Kaste]

you could also delegate; makes you better in control of the types in your class

class StatusObject(mapInput: MutableMap<String, Any?>) {
    val event: String by mapInput
    var otherVariable: YourComplexType? by mapInput
}

advantage of this method is that you can keep adding to the map after creation and the corresponding variables will update accordingly.