avoid_final_parameters

Avoid final for parameter declarations.

AVOID declaring parameters as final.

Declaring parameters as final can lead to unnecessarily verbose code, especially when using the "parameter_assignments" rule.

BAD:

void goodParameter(final String label) { // LINT
  print(label);
}

GOOD:

void badParameter(String label) { // OK
  print(label);
}

BAD:

void goodExpression(final int value) => print(value); // LINT

GOOD:

void badExpression(int value) => print(value); // OK

BAD:

[1, 4, 6, 8].forEach((final value) => print(value + 2)); // LINT

GOOD:

[1, 4, 6, 8].forEach((value) => print(value + 2)); // OK

The avoid_final_parameters rule is incompatible with the following rules:

• prefer_final_parameters

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

linter:
  rules:
    - avoid_final_parameters

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

linter:
  rules:
    avoid_final_parameters: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.