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

int buttonPin = 11;
int val = 0;
int sequence = 1;


void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(ledPin[i], OUTPUT);
  }
  pinMode(buttonPin, INPUT);
}

void loop() {

  val = digitalRead(buttonPin);
  if (val == LOW) {
    if (sequence == 3) {
      sequence = 1;
    } else {
      sequence++;
    }
  }

  switch (sequence) {
    case 1:
      oneAfterAnotherNoLoop();
      break;

    case 2:
      oneOnAtATime();
      break;

    case 3:
      //inAndOut();
      break;
  }
}

void oneAfterAnotherNoLoop() {
  int delayTime = 100;

  digitalWrite(ledPin[0], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[1], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[2], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[3], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[4], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[5], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[6], HIGH);
  delay(delayTime);
  digitalWrite(ledPin[7], HIGH);
  delay(delayTime);

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

void oneOnAtATime(){
  int delayTime = 100;

  for (int i = 0; i<= 7; i++){
    digitalWrite(ledPin[i], HIGH);
    delay(delayTime);
  }

  for(int i = 7; i >= 0; i--){
    digitalWrite(ledPin[i], LOW);
    delay(delayTime);
  }
}