int led_aray[4]={2,3,4,5};
void setup() {
for (int i=0;i<4;i++){

  pinMode(led_aray[i], OUTPUT);
}
}

void loop() {
 	TURN_ON_UP();
TURN_OFF_ALL();
      delay(1000);
TURN_ON_DOWN();
TURN_OFF_ALL();
      delay(1000);

}
void TURN_ON_UP(){
  for (int x=0;x<4;x++){
      digitalWrite(led_aray[x], HIGH);
      		delay(500);

  }
}

void TURN_ON_DOWN(){
  for (int x=3;x>-1;x--){
      digitalWrite(led_aray[x], HIGH);
      		delay(500);

  }
}

void TURN_OFF_ALL(){

  for (int x=0;x<4;x++){
      digitalWrite(led_aray[x], LOW);

}
}