Programming challenge: merging overlapping intervals

gistfile1.rb

class IntervalMerger

  def initialize(*intervals)
    @intervals = intervals
  end

  def merge
    @intervals.reduce([]) do |merged, i|
      is_merged = false
      merged.each_with_index do |m, index|
        if i[0] <= m[1] && i[1] >= m[0]
          merged[index] = [[i,m].map(&:first).min, [i,m].map(&:last).max]
          is_merged = true
          break
        end
      end
      merged << i unless is_merged
      merged
    end
  end

end

Easy peasy :)