write CSV ruby code example

Example 1: ruby create CSV

CSV.open("file.csv", "a+") do |csv|
  csv << ["cow", "3","2500"]
end

Example 2: save to csv ruby

CSV.open("filename.csv", "wb") do |row|
  row << ["a", "b", "c"]
end

Example 3: generate csv ruby

require 'csv'
csv_string = CSV.generate do |csv|
  csv << ["row", "of", "CSV", "data"]
  csv << ["another", "row"]
  # ...
end