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no_self_assignments

Learn about the no_self_assignments linter rule.

Stable

Don't assign a variable to itself.

Details

#

DON'T assign a variable to itself. Usually this is a mistake.

BAD:

dart 
class C {  int x; ​  C(int x) {  x = x;  } }

GOOD:

dart 
class C {  int x; ​  C(int x) : x = x; }

GOOD:

dart 
class C {  int x; ​  C(int x) {  this.x = x;  } }

BAD:

dart 
class C {  int _x = 5; ​  int get x => _x; ​  set x(int x) {  _x = x;  _customUpdateLogic();  } ​  void _customUpdateLogic() {  print('updated');  } ​  void example() {  x = x;  } }

GOOD:

dart 
class C {  int _x = 5; ​  int get x => _x; ​  set x(int x) {  _x = x;  _customUpdateLogic();  } ​  void _customUpdateLogic() {  print('updated');  } ​  void example() {  _customUpdateLogic();  } }

BAD:

dart 
class C {  int x = 5; ​  void update(C other) {  this.x = this.x;  } }

GOOD:

dart 
class C {  int x = 5; ​  void update(C other) {  this.x = other.x;  } }

Enable

#

To enable the no_self_assignments rule, add no_self_assignments under linter > rules in your analysis_options.yaml file:

analysis_options.yaml
yaml 
linter:  rules:  - no_self_assignments

If you're instead using the YAML map syntax to configure linter rules, add no_self_assignments: true under linter > rules:

analysis_options.yaml
yaml 
linter:  rules:  no_self_assignments: true

Unless stated otherwise, the documentation on this site reflects Dart 3.10.3. Report an issue.