Here you have multi-key lookup for Ruby. Original idea by @txustice: https://twitter.com/txustice/status/286790996438683648 I can actually think of use cases :-) If you know a better way for dealing with that return value let me know.

h.rb

class Hash
  alias_method :original, :[]
  def [](*keys)
    keys.uniq!
    if keys[1]
      keys.map { |key| original key }
    else
      original keys[0]
    end
  end
end

require 'minitest/autorun'
describe Hash do
  before do
    @h = {:a => 1, :b => 2}
  end

  describe "[] multikey support" do
    it 'must return single objects' do
      @h[:a].must_equal 1
      @h[:a, :a].must_equal 1
    end

    it 'must return an Array' do
      @h[:a,:b].must_equal [1,2]
      @h[:a,:b,:a,:b].must_equal [1,2]
    end
  end
end