no_ default_ cases
No default cases.
Details
#Switches on enums and enum-like classes should not use a default
clause.
Enum-like classes are defined as concrete (non-abstract) classes that have:
- only private non-factory constructors
- two or more static const fields whose type is the enclosing class and
- no subclasses of the class in the defining library
DO define default behavior outside switch statements.
BAD:
switch (testEnum) {
case TestEnum.A:
return '123';
case TestEnum.B:
return 'abc';
default:
return null;
}
GOOD:
switch (testEnum) {
case TestEnum.A:
return '123';
case TestEnum.B:
return 'abc';
}
// Default here.
return null;
Enable
#
To enable the
no_default_cases
rule, add
no_default_cases
under
linter > rules
in your
analysis_options.yaml
file:
linter:
rules:
- no_default_cases
If you're instead using the YAML map syntax to configure linter rules,
add
no_default_cases: true
under
linter > rules:
linter:
rules:
no_default_cases: true
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Report an issue.