Array iteration interview question

array_iteration.rb

def add1(arr, val, n)
  stop  = arr.length - 1
  count = 0

  (0..stop).each do |i|
    index = n < 0 ? stop - i : i

    if arr[index] == val
      arr[index] += 1
      count += 1
    end

    break if count == n.abs and n != 0
  end

  arr
end