default=(p1) public

Sets the default value, the value returned for a key that does not exist in the hash. It is not possible to set the a default to a Proc that will be executed on each key lookup. 

   h = { "a" => 100, "b" => 200 }
   h.default = "Go fish"
   h["a"]     #=> 100
   h["z"]     #=> "Go fish"
   # This doesn't do what you might hope...
   h.default = proc do |hash, key|
     hash[key] = key + key
   end
   h[2]       #=> #<Proc:0x401b3948@-:6>
   h["cat"]   #=> #<Proc:0x401b3948@-:6>
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