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Make A List Into A Line Suitable For A CSV File In Ruby

05.16.2006
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        Formats a list/array as a string suitable for one row of a CSV file

def comma_separate(items)
  items.map! do |item|
    if item.is_a?(String) and item =~ /[",]/
      '"' + item.gsub(/"/, '""') + '"'
    else
      item
    end
  end
  items.join(',')
end