fake year range string

year_range.rb

# Usage YearRange.new(2).range_string
# "1990-1991 | 2011-2013"
class YearRange
  def initialize(range = 1)
    @range = range
    @years = (1980..2015).to_a
  end

  def collect
    divide_factor = @years.size/@range
    @year_ranges = @years.each_slice(divide_factor).to_a.map do |years|
      years.sample(2).sort
    end
  end

  def range_string
    @year_ranges.map{|a| a.join('-')}.join(' | ')
  end
end