8 led pattern with for loop

 int d = 50;           // The higher the number, the slower the timing.

void setup() {

  // use a for loop to initialize each pin as an output:

  for (int Pin = 0; Pin < 8;Pin++) {

    pinMode(Pin, OUTPUT);

  }

}

void loop() {

  // loop from the lowest pin to the highest:

  for (int Pin = 0; Pin < 8; Pin++) {

    // turn the pin on:

    digitalWrite(Pin, HIGH);

    delay(d);

    // turn the pin off:

    digitalWrite(Pin, LOW);

  }

  // loop from the highest pin to the lowest:

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

    // turn the pin on:

    digitalWrite(Pin, HIGH);

    delay(d);

    // turn the pin off:

    digitalWrite(Pin, LOW);

  }

}