Knight Rider LED on Ardino

KnightRider.ino

#   Copyright 2018 Vanji
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

int pintarray[] = {1,2,3,4,5,6,7,8,9,10};
int counter =0;
int timer=50;

void setup() {
  counter=0;
  while(counter<10){
      pinMode(pintarray[counter],OUTPUT);
      counter++;
    } 
}

void loop() {
  counter=0;
  while(counter<10){
      digitalWrite(pintarray[counter],HIGH);
      delay(timer);
      digitalWrite(pintarray[counter],LOW);
      counter++;
    } 
    
  counter=10;
  while(counter>=0){
      digitalWrite(pintarray[counter],HIGH);
      delay(timer);
      digitalWrite(pintarray[counter],LOW);
      counter--;
    } 
}