is there any way to get the type of an anonymous o...

# getting-started

[johnfn]

is there any way to get the type of an anonymous object? e.g. if i do object { val x = 1 } and then i want to make a list of them, how would i write it? ideally, something that i could put in ???

class Foo {
  private val myList = mutableListOf<???>()
  private fun addItem(x: Int) =
    myList.add(
      object { val x = x }
    )
}

[Shawn]

Any

[Shawn]

anonymous objects that don’t explicitly implement an interface or extend a class will just inherit from Any like everything does by default

[Shawn]

but that won’t let you access your x val

[Shawn]

if all the objects you’ll have in that list have the same shape (i.e. the same properties/functions defined on them), then you can declare an interface and have the objects implement them (or just declare and instantiate data classes)

[Shawn]

if that doesn’t match your use case and you just want arbitrary mappings between keys and values, use a Map

[Shawn]

but you’ll never be able to have a strongly typed, arbitrarily-defined object anywhere that’s not within the scope of a function

[Chenn]

val obj = js("{}")
    obj["type"] = type

This is how I put a key - value pair in an anonymous object in kotlin. Maybe it helps.

[Chenn]

val obj: dynamic = object{}
    reducers.forEach { obj[it.key] = it.value}

This practically generates the same code..

[Shawn]

is that for Kotlin/JS? js() isn’t a stdlib function and dynamic isn’t a standard type on JVM, and presumably elsewhere

[Chenn]

Yes, you got me there. Thought I was still in the #javascript channel. My bad