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Kotlin: get a list of some property values from a collection / list of objects
import kotlin.reflect.KMutableProperty1
inline fun <reified T, Y> MutableList<T>.arrayListOfField(property: KMutableProperty1<T, Y?>): ArrayList<Y> {
val output = ArrayList<Y>()
this.forEach {t: T ->
output.add(property.get(t) as Y)
return output
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