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() => (langCode != null && countryCode != null)
? langCode!.toLowerCase() + '_' + countryCode!.toUpperCase()
: langCode != null
? langCode!.toLowerCase()
: super.toString();