int potpin = 0;
int val;    // variable to read the value from the analog pin
const int ledCount = 10; 
int ledPins[] = {12,11,10,9,8,7,6,5,4,3}; // Added closing bracket

void setup() {
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }
}

void loop() {
  val = analogRead(potpin);     
  val = map(val, 0, 1023, 0, 10);
   
      
  for (int i = 0; i < ledCount; i++) { // Loop to control LEDs
    if (i < val) {
      digitalWrite(ledPins[i], HIGH); // Turn on LEDs up to val
    } else {
      digitalWrite(ledPins[i], LOW); // Turn off LEDs beyond val
    }
  }
}