//inisiasi Jumlah LED
const int numLED = 4;
//LED 1,2,3,4 menjadi 1 variabel
//Dengan index 0,1,2,3
const int pinLED[numLED] = {8,9,10,11};

void setup() {
  //inisiasi semua pin sebagai output
  for (int i = 0; i < 4; i++) {
    pinMode(pinLED[i], OUTPUT);
  }
}

void loop(){
  
  for (int i = 0; i < 3; i++) {
    digitalWrite(pinLED[i], HIGH);
    delay(100);
    digitalWrite(pinLED[i], LOW);
  }

  //hidupkan led indeks 3 
  for (int i = 3; i > 0; i--) {
    digitalWrite(pinLED[i], HIGH);
    delay(500);
    digitalWrite(pinLED[i], LOW);
  }

}