Hash#nested_fetch

gistfile1.rb

module NestedFetch
  def nested_fetch(*keys)
    keys.inject(self) do |hash, key|
      (v = hash[key]).nil? ? break : v
    end
  end
end

Hash.class_eval { include NestedFetch }

h = {
  info: {
    user: {
      name: 'moro',
    }
  }
}

h.nested_fetch(:info, :user, :name) # => "moro"
h.nested_fetch(:info, :user) # => {:name=>"moro"}
h.nested_fetch(:info, :user, :email) # => nil
h.nested_fetch(:foo, :bar) # => nil