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() {
  if (this == unity) {
    return '1';
  }

  final buffer = StringBuffer();

  if (_unitsUp.isEmpty) {
    buffer.write('1');
  } else {
    buffer.writeAll(_unitsToStrings(_unitsUp), ' · ');
  }

  if (_unitsDown.isNotEmpty) {
    buffer.write(' / ');
    final stringList = _unitsToStrings(_unitsDown).toList(growable: false);

    if (stringList.length == 1) {
      buffer.write(stringList[0]);
    } else {
      buffer.write('(');
      buffer.writeAll(stringList, ' · ');
      buffer.write(')');
    }
  }

  return buffer.toString();
}