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() {
  if (keyPath.isEmpty == true) {
    return "Failed to read '${configuration.runtimeType}'\n\t-> $message";

  final joinedKeyPath = StringBuffer();
  for (var i = 0; i < keyPath.length; i++) {
    final thisKey = keyPath[i];

    if (thisKey is String) {
      if (i != 0) {
    } else if (thisKey is int) {
    } else {
      throw StateError("not an int or String");

  return "Failed to read key '${joinedKeyPath}' for '${configuration.runtimeType}'\n\t-> $message";