transform library

Column manipulation and aggregation extensions for CsvTable.

Manipulation (CsvTableManipulation):

• CsvTableManipulation.addColumn / CsvTableManipulation.insertColumn: add columns with default values.
• CsvTableManipulation.removeColumn / CsvTableManipulation.removeColumnAt: remove and return column values.
• CsvTableManipulation.renameColumn: rename a column.
• CsvTableManipulation.reorderColumns: reorder to new column order.
• CsvTableManipulation.transformColumn: apply a function to every cell in a column.
• CsvTableManipulation.map / CsvTableManipulation.fold: functional row operations.

Aggregation (CsvTableAggregation):

• CsvTableAggregation.count, CsvTableAggregation.sum, CsvTableAggregation.avg: numeric statistics.
• CsvTableAggregation.min / CsvTableAggregation.max: type-aware extremes.
• CsvTableAggregation.groupBy: group rows by column value into sub-tables.

table.addColumn('score', defaultValue: 0);
print(table.avg('age'));
final groups = table.groupBy('department');