ヅラッシュ！ by NI-Lab.

環境
* MacBook Air MC506J/A
* ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-darwin10]

$ cat ./hashsub.rb
#!/usr/bin/env ruby
 
class MyHash < Hash
  def set_all(data)
    self.each_key{|key|
      self[key] = data 
    }
  end
end
 
hash1 = Hash.new
hash1["Hash"] = "hash1"
hash1["a"] = "A"
hash1["b"] = "B"
hash1["c"] = "C"
p hash1
 
hash2 = MyHash.new
hash2["Hash"] = "hash2"
hash2["a"] = "A"
hash2["b"] = "B"
hash2["c"] = "C"
p hash2
 
hash3 = MyHash.new
hash3["Hash"] = "hash3"
hash3["a"] = "A"
hash3["b"] = "B"
hash3["c"] = "C"
hash3.set_all "XYZ"
p hash3

んで、実行。

$ ruby ./hashsub.rb
{"a"=>"A", "b"=>"B", "c"=>"C", "Hash"=>"hash1"}
{"a"=>"A", "b"=>"B", "c"=>"C", "Hash"=>"hash2"}
{"a"=>"XYZ", "b"=>"XYZ", "c"=>"XYZ", "Hash"=>"XYZ"}