Contents

use_late_for_private_fields_and_variables

Contents

Use late for private members with a non-nullable type.

This rule is currently experimental and available as of Dart 2.10.

Details

#

Use late for private members with non-nullable types that are always expected to be non-null. Thus it's clear that the field is not expected to be null and it avoids null checks.

BAD:

dart
int? _i;
m() {
  _i!.abs();
}

GOOD:

dart
late int _i;
m() {
  _i.abs();
}

OK:

dart
int? _i;
m() {
  _i?.abs();
  _i = null;
}

Usage

#

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

analysis_options.yaml
yaml
linter:
  rules:
    - use_late_for_private_fields_and_variables