Series

series.rb

class Series
  attr_reader :series
  
  def initialize(series)
    @series = series
  end
  
  def slices(slice)
    valid?(slice)
    last_valid_index = series.length - slice
    final_combos = []
    series.each_char.with_index do |char, index|
      if index <= last_valid_index
        combination = []
        n = 0
        while n < slice do
          combination << series[index + n].to_i
          n += 1
        end
        final_combos << combination
      end
    end
    final_combos
  end
  
  private
  
  def valid?(slice)
    fail ArgumentError if series.length - slice < 0
  end
end