OpenStruct#dig

* lib/ostruct.rb (dig): Implement OpenStruct#dig
  [Feature #11688]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52611 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index 63146075be..0e13f40692 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -215,6 +215,24 @@ class OpenStruct
   end
 
   #
+  # Retrieves the value object corresponding to the each +name+
+  # objects repeatedly.
+  #
+  #   address = OpenStruct.new('city' => "Anytown NC", 'zip' => 12345)
+  #   person = OpenStruct.new('name' => 'John Smith', 'address' => address)
+  #   person.dig(:address, 'zip') # => 12345
+  #   person.dig(:business_address, 'zip') # => nil
+  #
+  def dig(name, *names)
+    begin
+      name = name.to_sym
+    rescue NoMethodError
+      return
+    end
+    @table.dig(name, *names)
+  end
+
+  #
   # Remove the named field from the object. Returns the value that the field
   # contained if it was defined.
   #