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 (message.isNotEmpty) {
    return message;
  }
  if (argumentValue.isNotEmpty) {
    return '"$argumentValue" is not a correct value${argumentName.isNotEmpty ? ' for $argumentName' : ''}';
  }
  if (argumentName.isNotEmpty) {
    return '"$argumentName" value is incorrect';
  }
  return 'incorrect arguments';
}