1 files changed, 51 insertions, 0 deletions
diff --git a/mrbgems/mruby-symbol-ext/mrblib/symbol.rb b/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
index f716162e8..a4e8ef7a8 100644
--- a/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
+++ b/mrbgems/mruby-symbol-ext/mrblib/symbol.rb
@@ -6,4 +6,55 @@ class Symbol
     end
   end
 
+  ##
+  # call-seq:
+  #   sym.length    -> integer
+  #
+  # Same as <code>sym.to_s.length</code>.
+
+  def length
+    self.to_s.length
+  end
+  alias :size :length
+
+  ##
+  # call-seq:
+  #   sym.capitalize  -> symbol
+  #
+  # Same as <code>sym.to_s.capitalize.intern</code>.
+
+  def capitalize
+    self.to_s.capitalize.intern
+  end
+
+  ##
+  # call-seq:
+  #   sym.downcase  -> symbol
+  #
+  # Same as <code>sym.to_s.downcase.intern</code>.
+
+  def downcase
+    self.to_s.downcase.intern
+  end
+
+  ##
+  # call-seq:
+  #   sym.upcase    -> symbol
+  #
+  # Same as <code>sym.to_s.upcase.intern</code>.
+
+  def upcase
+    self.to_s.upcase.intern
+  end
+
+  #
+  # call-seq:
+  #   sym.empty?   -> true or false
+  #
+  # Returns that _sym_ is :"" or not.
+
+  def empty?
+    self.to_s.empty?
+  end
+
 end