Kotlin foreach object - arrays

Question

I have a object class,
object Examples {
const val E = 1
const val X = 2
const val A = 3
const val M = 4
const val P = 5
const val L = 6
}
if I use
Examples.E
it will reference the relevant const val, but how can I iterate over each val without calling them individually?

Answer 1

It looks like you want an enum:
enum class Example(val intVal: Int) {
E(1), X(2), A(3), M(4), P(5), L(6);
}
You can access specific values like Example.E.intVal. To get a collection of all the values, you can do Example.values() or enumValues<Example>()

Answer 2

Well, best way to do this is use Enum class.
But you also could implement Iterable interface on yours object. And after this you will be able to use forEach/map/fold/filter and other useful Iterable extension functions
object Examples : Iterable<Int> {
const val E = 1
const val X = 2
const val A = 3
const val M = 4
const val P = 5
const val L = 6
override fun iterator(): Iterator<Int> {
return object : Iterator<Int> {
private var i = 1
override fun hasNext(): Boolean = i <= 6
override fun next(): Int {
return when (i++) {
1 -> E
2 -> X
3 -> A
4 -> M
5 -> P
6 -> L
else -> error("No such element exeption")
}
}
}
}
}
Examples.forEach {
println(it)
}

Answer 3

With Kotlin, you could use reflection to get all values inside an object.
However, did you consider using an Enum class? This seems like it would fit your use case better:
enum class Letter {
A,
B,
C
}
You can get all possible values for Letter using
Letter.values()
Or if what you want is to be able to reference repeated elements in order, you could use an array, or just a string, if the elements are always letters.
Also keep in mind you have two values called "E" defined, which wouldn't work.