From 8e637bdd83505e8c1723f87a8d267e00ee209787 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sun, 19 May 2019 22:15:27 +0900
Subject: Should clarify the role of `mruby-kernel-ext` and `mruby-object-ext`;
 close #4449

The former should contain function like methods, and the latter should
contain methods shared by all objects.
---
 mrbgems/mruby-object-ext/mrblib/object.rb | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'mrbgems/mruby-object-ext/mrblib/object.rb')

diff --git a/mrbgems/mruby-object-ext/mrblib/object.rb b/mrbgems/mruby-object-ext/mrblib/object.rb
index 581156cb0..f014df469 100644
--- a/mrbgems/mruby-object-ext/mrblib/object.rb
+++ b/mrbgems/mruby-object-ext/mrblib/object.rb
@@ -1,4 +1,18 @@
-class Object
+module Kernel
+  # call-seq:
+  #   obj.yield_self {|_obj|...} -> an_object
+  #   obj.then {|_obj|...}       -> an_object
+  #
+  # Yields <i>obj</i> and returns the result.
+  #
+  #   'my string'.yield_self {|s|s.upcase} #=> "MY STRING"
+  #
+  def yield_self(&block)
+    return to_enum :yield_self unless block
+    block.call(self)
+  end
+  alias then yield_self
+
   ##
   #  call-seq:
   #     obj.tap{|x|...}    -> obj
-- 
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