//making all the arrays and variables for the code
int buttonsCheck[] = {10, 9, 8, 7, 6, 5, 4, 3, 2};
int leds[] = {50, 48, 46, 44, 42, 40, 38, 36, 34};
const unsigned long dealyTime = 50;
unsigned long pastTime = 0;
int index = 50;
int helper = 0;

void setup() {

//making all the leds' pins to OUTPUT
  for (int led : leds) {
    pinMode(led, OUTPUT);
  }

//making all the buttons' pins INPUT_PULLUP to ignore the resistor...
  for (int checkerPin : buttonsCheck) {
    pinMode(checkerPin, INPUT_PULLUP);
  }
}

//making a function for shutting down all the leds
void noOther() {
  for (int i : leds) {
    digitalWrite(i, LOW);
  }
}

void action() {

  unsigned long currentTime = millis();
  if (currentTime - pastTime >= dealyTime) {
    
//go through all the buttons, check them one by one if they pressed or not
//if yes, make that led's state HIGH that is the same indexed element of the leds array
    for (int button : buttonsCheck) {

      digitalWrite(index, !digitalRead(button));
      /*if (digitalRead(button) == LOW) {
        digitalWrite(index, HIGH);
      }
      if (digitalRead(button) == HIGH) {
        digitalWrite(index, LOW);
      }*/
      index -= 2;
    }
    
    index = 50;
    pastTime = currentTime;
  }
}

void loop() {

  action();
}