no_default_cases
No default cases.
This rule is currently experimental and available as of Dart 2.9.
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:
dart
switch (testEnum) {
case TestEnum.A:
return '123';
case TestEnum.B:
return 'abc';
default:
return null;
}
GOOD:
dart
switch (testEnum) {
case TestEnum.A:
return '123';
case TestEnum.B:
return 'abc';
}
// Default here.
return null;
Usage
#To enable the no_default_cases
rule, add no_default_cases
under linter > rules in your analysis_options.yaml
file:
analysis_options.yaml
yaml
linter:
rules:
- no_default_cases
Unless stated otherwise, the documentation on this site reflects Dart 3.5.3. Page last updated on 2024-07-03. View source or report an issue.