rbx_hash_update_issue.rb

#!/usr/bin/env ruby
require 'pp'

class Foo
  IUPAC_CODE = {
    :I => "Ile",
    :V => "Val",
    :L => "Leu",
    :F => "Phe",
    :C => "Cys",
    :M => "Met",
    :A => "Ala",
    :G => "Gly",
    :T => "Thr",
    :W => "Trp",
    :S => "Ser",
    :Y => "Tyr",
    :P => "Pro",
    :H => "His",
    :E => "Glu",
    :Q => "Gln",
    :D => "Asp",
    :N => "Asn",
    :K => "Lys",
    :R => "Arg",
    :U => "Sec",
    :O => "Pyl",
    :B => "Asx",
    :Z => "Glx",
    :X => "Xaa"
  }

  def original_hash
    IUPAC_CODE
  end

  def update_hash
    IUPAC_CODE.update(IUPAC_CODE){|k, v| 0.0 }
  end
end

pp Foo.new.update_hash

# ruby-1.9.3-p134
#
# => {:I=>0.0,
#     :V=>0.0,
#     :L=>0.0,
#     :F=>0.0,
#     :C=>0.0,
#     :M=>0.0,
#     :A=>0.0,
#     :G=>0.0,
#     :T=>0.0,
#     :W=>0.0,
#     :S=>0.0,
#     :Y=>0.0,
#     :P=>0.0,
#     :H=>0.0,
#     :E=>0.0,
#     :Q=>0.0,
#     :D=>0.0,
#     :N=>0.0,
#     :K=>0.0,
#     :R=>0.0,
#     :U=>0.0,
#     :O=>0.0,
#     :B=>0.0,
#     :Z=>0.0,
#     :X=>0.0}

# rbx-2.0.0-dev -X18
#
# => {:Y=>0.0,
#     :Z=>0.0,
#     :E=>0.0,
#     :H=>0.0,
#     :I=>"Ile",
#     :G=>0.0,
#     :Q=>"Gln",
#     :F=>"Phe",
#     :S=>0.0,
#     :K=>"Lys",
#     :T=>0.0,
#     :U=>0.0,
#     :P=>0.0,
#     :D=>0.0,
#     :X=>"Xaa",
#     :L=>"Leu",
#     :M=>"Met",
#     :W=>0.0,
#     :A=>0.0,
#     :O=>"Pyl",
#     :N=>0.0,
#     :R=>"Arg",
#     :B=>"Asx",
#     :V=>0.0,
#     :C=>0.0}