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afa/gist:2043722

Created March 15, 2012 11:18
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зачистка всех непозволенных ключей из хэша
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gistfile1.rb
{1=>2, 3=>4}.select{|a, b| [1].include? a }.inject({}){|r, v| r.merge(v[0] => v[1]) }
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