Kotlin Delegate

snippet.kt

class Capitalizer {
  var value: String? = null
  
  operator fun getValue(thisRef: Any?, property: KProperty<*>): String? {
      return value
  }

  operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String?) {
      this.value = value?.capitalize()
  }
}

class Person {
  var firstName by Capitalizer()
  var lastName by Capitalizer()
}