toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  final columns = [...numericColumns.keys, ...categoricColumns.keys],
      table = toListOfMaps(),
      maxWidths = {
        for (final key in columns)
          key: [
            key.length,
            ...[for (final row in table) row[key]!.length]
          ].reduce(math.max)
      },
      line = (String edge, String connect) =>
          edge +
          [for (final column in columns) "-" * maxWidths[column]!]
              .join(connect) +
          edge,
      row = (Iterable<String> cells) => "|${cells.join("|")}|",
      sb = StringBuffer("\n")
        ..writeln(line(".", "."))
        ..writeln(row(columns.map((key) => key.padRight(maxWidths[key]!))))
        ..writeln(line(":", "+"));

  for (final r in table) {
    sb.writeln(row(columns.map(
        (key) => r[key]!.replaceAll('"', "").padRight(maxWidths[key]!))));
  }

  sb.writeln(line("'", "'"));

  return sb.toString();
}