getVariant abstract method
Returns the variant of this locale, or null if not specified.
The variant provides additional specificity beyond language and country, useful for regional dialects or specialized locale requirements.
Example:
final locale1 = Locale('en', 'US', 'POSIX');
print(locale1.getVariant()); // Output: "POSIX"
final locale2 = Locale('en', 'US');
print(locale2.getVariant()); // Output: null
Implementation
String? getVariant();