Series

series.rb

class Series
  attr_reader :digits

  def initialize(string_of_digits)
    @digits = string_of_digits.chars.map(&:to_i)
  end

  def slices(slice_size)
    fail ArgumentError, "Slice size cannot exceed caller's digit size." if slice_size > digits.size
    result = []
    until digits.size < slice_size
      result << digits.slice(0, slice_size)
      digits.shift(1)
    end
    result
  end
end