Array for LEDs

int pinArray[]={2,3,4,5,6,7,8,9}; //declare an array used for pin numbers

void setup() {

for (int i=0;i<8;i++){

pinMode(pinArray[i], OUTPUT); //loop through this array to set all those pins as outputs

}

}

void loop() {

for (int i=0;i<8;i++){

digitalWrite(pinArray[i],HIGH); //loop through to turn each pin on

delay(200);

}

for (int i=7;i>=0;i--){

digitalWrite(pinArray[i],LOW); //loop through to turn each pin off

delay(200);

}

}