collect_keyvalue.rb

# Module containing a collect_kv method to allow
# a new hash to be generated my collect instead
# of returning an array of modified keys or values
module CollectKeyValue

  # Takes a block that returns a [key, value] pair
  # and builds a new hash based on those pairs
  def collect_kv
    result = {}
    each do |k,v|
      new_k, new_v = yield k, v
      result[new_k] = new_v
    end
    result
  end

end