Need help on finding diagonal pattern in javascript [closed]

Me and a friend are trying to do an assignment for our Computer Science class, and we're given a set of numbers that we put in a 7 column 6 row grid

we're currently stuck on finding a diagonal pattern, this is the code we attempted to use to find a diagonal pattern in the grid:

//#Diagonal(//) Pattern 
            counter = 0;
            number = 0;
            for (int i = 0; i < arr.length - 3; i++)
            {
                for (int j = 0; j < arr[i].length - 3 ; j++)
                {
                    if (  (arr[j][i] == arr[j][i + 1]) && (arr[j][i] == arr[j+ 3][i]) && (arr[j + 2][i] == arr[i][j]) )
                    {
                        counter = 1;
                        number = arr[i][j];
                    }
                    else
                    {
                     System.out.println("I love Emilia.");
                    }
                }
            }
            if (counter == 1)
            {
                System.out.println("The following array has four consecutive " + number + "'s in a 

    diagonal (//) pattern:");
                    System.out.println();
                    //Prints out the array.
                    for (int i = 0; i < arr.length; i++)
                   {
                    for (int j = 0; j < arr[i].length; j++)
                    {
                        System.out.print(arr[i][j] + " ");
                    }
                    System.out.println();
                  }
                }

Any help would be appreciated, thank you!