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prefer_expression_function_bodies

Contents
Stable
Fix available

Use => for short members whose body is a single return statement.

Details

#

CONSIDER using => for short members whose body is a single return statement.

BAD:

dart
get width {
  return right - left;
}

BAD:

dart
bool ready(num time) {
  return minTime == null || minTime <= time;
}

BAD:

dart
containsValue(String value) {
  return getValues().contains(value);
}

GOOD:

dart
get width => right - left;

GOOD:

dart
bool ready(num time) => minTime == null || minTime <= time;

GOOD:

dart
containsValue(String value) => getValues().contains(value);

Enable

#

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

analysis_options.yaml
yaml
linter:
  rules:
    - prefer_expression_function_bodies

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

analysis_options.yaml
yaml
linter:
  rules:
    prefer_expression_function_bodies: true

Unless stated otherwise, the documentation on this site reflects Dart 3.7.0. Page last updated on 2025-01-27. View source or report an issue.