Hash#megamap

megamap.rb

class Hash
  def mega_map(key_transform, value_transform)
    new_keys = keys.map(&key_transform)
    new_values = values.map(&value_transform)
    Hash[new_keys.zip(new_values)]
  end
end

hash = {"succeeded"=>"node2", "flagged"=>"node3"}
transform = ->(v){v.to_sym}
hash.mega_map(transform, transform)
# => {:succeeded=>:node2, :flagged=>:node3}

So fancy! Very cool passage of the transform lambda into map.