Get activity from context - iterative vs tail recursion

ContextUtil.kt

private fun Context?.findActivity_iter(): Activity? {
  var context = this
  while (context is ContextWrapper) {
    if (context is Activity) {
      return context
    }
    context = context.baseContext
  }
  return null
}

private tailrec fun Context?.findActivity_rec(): Activity? =
    when (this) {
      is Activity -> this
      is ContextWrapper -> baseContext.findActivity_rec()
      else -> null
    }