marcandre	2010-03-07 02:18:53 +0900 (Sun, 07 Mar 2010)

  New Revision: 26833

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26833

  Log:
    * hash.c (Hash#merge doc): Added explanation for form with block.

  Modified files:
    branches/ruby_1_8/hash.c

Index: ruby_1_8/hash.c
===================================================================
--- ruby_1_8/hash.c	(revision 26832)
+++ ruby_1_8/hash.c	(revision 26833)
@@ -1828,12 +1828,16 @@
  *     hsh.merge(other_hash){|key, oldval, newval| block} -> a_hash
  *
  *  Returns a new hash containing the contents of <i>other_hash</i> and
- *  the contents of <i>hsh</i>, overwriting entries in <i>hsh</i> with
- *  duplicate keys with those from <i>other_hash</i>.
+ *  the contents of <i>hsh</i>. If no block is specified, the value for
+ *  entries with duplicate keys will be that of <i>other_hash</i>. Otherwise
+ *  the value for each duplicate key is determined by calling the block
+ *  with the key, its value in <i>hsh</i> and its value in <i>other_hash</i>.
  *
  *     h1 = { "a" => 100, "b" => 200 }
  *     h2 = { "b" => 254, "c" => 300 }
  *     h1.merge(h2)   #=> {"a"=>100, "b"=>254, "c"=>300}
+ *     h1.merge(h2){|key, oldval, newval| newval - oldval}
+ *                    #=> {"a"=>100, "b"=>54,  "c"=>300}
  *     h1             #=> {"a"=>100, "b"=>200}
  *
  */

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