Speed Adjustable Led Black Lightning

1int ledPins[] = {2, 3, 4, 5, 6, 7};
2int potValue;
3
4void setup() {
5  for(int i = 0; i < 6; i++) {
6    pinMode(ledPins[i], OUTPUT);
7  }
8}
9
10void loop() {
11  for(int i = 0; i < 6; i++) {
12    potValue = analogRead(A0);
13    digitalWrite(ledPins[i], HIGH);
14    delay(potValue);
15    digitalWrite(ledPins[i], LOW);
16  }
17
18  for(int i = 4; i > 0; i--) {
19    potValue = analogRead(A0);
20    digitalWrite(ledPins[i], HIGH);
21    delay(potValue);
22    digitalWrite(ledPins[i], LOW);
23  }
24}