toString method Null safety

  1. @override
String toString()
override

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 represetion.

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() => <String>[
      'CheckedFromJsonException',
      if (_className != null) 'Could not create `$_className`.',
      if (key != null) 'There is a problem with "$key".',
      if (message != null)
        message!
      else if (innerError != null)
        innerError.toString(),
    ].join('\n');