toString method
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 (topics.isEmpty) {
return 'Missing one or many expression matching one or several topics';
}
return 'Mercure: Malformed Uniform Resource Identifier (URI): $hub';
}