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Hash delete key

November 29, 2010
ruby-1.9.1-p378 > h = { "a" => 100, "b" => 200 }
=> {"a"=>100, "b"=>200}
ruby-1.9.1-p378 > h.delete("a")
=> 100
ruby-1.9.1-p378 > h
=> {"b"=>200}
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