hash.rb

# Instead of:
#    hash[:a].try(:[], :b).try(:[], :c).try(:[], :d)
# you can write
#    hash[:a, :b, :c, :d]

class Hash
  # h = {:a => {:b => {:c => 1}}}
  # p h[:a]             # => {:b => {:c => 1}}
  # p h[:a, :b]         # => {:c => 1}
  # p h[:a, :b, :c]     # => 1
  # p h[:a, :b, :c, :d] # => nil
  # p h[:x, :y, :z]     # => nil
  alias_method :_orig_get, :[]

  def [](*args)
    args.inject(self){|h,k| h.try(:_orig_get, k) }
  end
end