toString method Null safety

  1. @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.


String toString() {
  final String additional = skipOffstage ? ' (ignoring offstage widgets)' : '';
  final List<Element> widgets = evaluate().toList();
  final int count = widgets.length;
  if (count == 0) {
    return 'zero widgets with $description$additional';
  if (count == 1) {
    return 'exactly one widget with $description$additional: ${widgets.single}';
  if (count < 4) {
    return '$count widgets with $description$additional: $widgets';
  return '$count widgets with $description$additional: ${widgets[0]}, ${widgets[1]}, ${widgets[2]}, ...';