Add `Kernel#yield_self`; CRuby2.5

1 files changed, 13 insertions, 0 deletions

diff --git a/mrbgems/mruby-kernel-ext/mrblib/kernel.rb b/mrbgems/mruby-kernel-ext/mrblib/kernel.rb
new file mode 100644
index 000000000..25a4d4ed4
--- /dev/null
+++ b/mrbgems/mruby-kernel-ext/mrblib/kernel.rb
@@ -0,0 +1,13 @@
+module Kernel
+  # call-seq:
+  #   obj.yield_self {|_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
+end