use_function_type_syntax_for_parameters

Use generic function type syntax for parameters.

Use generic function type syntax for parameters.

BAD:

Iterable<T> where(bool predicate(T element)) {}

GOOD:

Iterable<T> where(bool Function(T) predicate) {}

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

linter:
  rules:
    - use_function_type_syntax_for_parameters

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

linter:
  rules:
    use_function_type_syntax_for_parameters: true

Unless stated otherwise, the documentation on this site reflects Dart 3.7.1. Page last updated on 2025-03-07. View source or report an issue.