what is format to make digitalWrite variable?

So make an array, will duplicate the info of led2, led3, led4, etc.

byte ledPin[] = {2,3,4,5,10,11,12,13,}; // elements 0 to 7   << declare this with the variables

for (i=0; i<8; i=i+1){
pinMode (ledPin[i], OUTPUT);
}

and
for (i=4;i<8;i++) // 10,11,12,13 to switch
  {
    digitalWrite(ledPin[i], HIGH);   // turn the LED on
    delay(10);               // wait for a second               << this is 10mS; use 1000 for 1 sec
    digitalWrite(ledPin[i], LOW);
    delay(10);
  }