int ledpins[] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {
  for (int index = 0; index <= 7; index++) {
    pinMode(ledpins[index], OUTPUT);
  }
}

void loop() {
  OneAfterAnotherNoLoop();
}

void OneAfterAnotherNoLoop() {
  digitalWrite(ledpins[0], HIGH); 
  delay(100);
  digitalWrite(ledpins[1], HIGH);
  delay(100);
  digitalWrite(ledpins[2], HIGH);
  delay(100);
  digitalWrite(ledpins[3], HIGH); 
  delay(100);
  digitalWrite(ledpins[4], HIGH); 
  delay(100);
  digitalWrite(ledpins[5], HIGH); 
  delay(100);
  digitalWrite(ledpins[6], HIGH); 
  delay(100);
  digitalWrite(ledpins[7], HIGH); 
  delay(100);

  digitalWrite(ledpins[7], LOW); 
  delay(100);
  digitalWrite(ledpins[6], LOW); 
  delay(100);
  digitalWrite(ledpins[5], LOW); 
  delay(100);
  digitalWrite(ledpins[4], LOW); 
  delay(100);
  digitalWrite(ledpins[3], LOW); 
  delay(100);
  digitalWrite(ledpins[2], LOW); 
  delay(100);
  digitalWrite(ledpins[1], LOW); 
  delay(100);
  digitalWrite(ledpins[0], LOW); 
  delay(100);
}