Led Wave!

int ledCount = 5;
int leds[] = {13, 12, 11, 10, 9};
int currentState[] = {HIGH, LOW, LOW, LOW, LOW};
int currentHighLed = 0;

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

void loop() {

for (int i = 0; i < ledCount; i++) {
digitalWrite(leds[i], currentState[i]);
}
currentState[currentHighLed] = LOW;
currentHighLed++;
if (currentHighLed >= 5) {
currentHighLed = 0;
}
currentState[currentHighLed] = HIGH;
delay(500);
}