From: salai Date: 2009-07-09T01:33:17+09:00 Subject: own method has_key for class Hash. -howto Dear all, Can you help me how can I implement my own "has_key" method for "hash class." class Hash def my_each_key(&block) self.each { |key| yield(key[0]) } end def my_each_value(&block) self.each { |value| yield(value[1]) } end def has_key() #todo end end h = {1 => 1.0, 2 => 2.0, 3 => 3.0 } many thanks in advance, salai.