This node uses Ruby-wrapper. See knime.rb at ruby4knime
Also, you can include additional gems from an external jRuby installation. But before that do setup jRuby path in preferences.
row # Only row!
row << Cells.new.string('Hi!').int(row.to_s.length))
Cells.new.double(row.to_f).double(row.to_f - row.to_f)
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