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 buffer = StringBuffer();
  if (isNegativeDuration) {
    buffer.write('-');
  }
  buffer.write('P');
  if (years != 0) {
    buffer
      ..write(years)
      ..write('Y');
  }
  if (months != 0) {
    buffer
      ..write(months)
      ..write('M');
  }
  if (weeks != 0) {
    buffer
      ..write(weeks)
      ..write('W');
  }
  if (days != 0) {
    buffer
      ..write(days)
      ..write('D');
  }
  if (hours != 0 || minutes != 0 || seconds != 0 || buffer.length == 1) {
    buffer.write('T');
    buffer
      ..write(hours)
      ..write('H')
      ..write(minutes)
      ..write('M')
      ..write(seconds)
      ..write('S');
  }
  return buffer.toString();
}