sample-of-bad-good-if.kt

fun runBarFlowBad() {
  if (
    user.role == UserDto.Role.ADMIN ||
      (user.status == UserDto.Status.VIP ||
      (user.status == UserDto.Status.TRIAL_VIP && user.paymentTransactionList.isNotEmpty()) 
     && user.age.isAdult())
  ) {
    // do something
  } else {
    // do something else
  }
}

fun runBarFlowGood() {
  val isAdmin = user.role == UserDto.Role.ADMIN
  val isUserHasUnCompletePayment = user.status == UserDto.Status.TRIAL_VIP && user.paymentTransactionList.isNotEmpty()
  val isUserHasPayments = user.status == UserDto.Status.VIP || isUserHasUnCompletePayment
  val isUserAdult = user.age.isAdult()
  val isNormalUserHasAccessToFeature = isUserAdult && isUserHasPayments 
  
  if (isAdmin || isNormalUserHasAccessToFeature)
  ) {
    // do something
  } else {
    // do something else
  }
}