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====== Option +write_nil_value+ Specifies the object that is to be substituted for each +nil+-valued field. Default value: CSV::DEFAULT_OPTIONS.fetch(:write_nil_value) # => nil Without the option: str = CSV.generate_line(['a', nil, 'c', nil]) str # => "a,,c,\n" With the option: str = CSV.generate_line(['a', nil, 'c', nil], write_nil_value: "x") str # => "a,x,c,x\n"