unnecessary_null_checks

Unnecessary null checks.

DON'T apply a null check where a nullable value is accepted.

BAD:

f(int? i) {}
m() {
  int? j;
  f(j!);
}

GOOD:

f(int? i) {}
m() {
  int? j;
  f(j);
}

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

linter:
  rules:
    - unnecessary_null_checks

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

linter:
  rules:
    unnecessary_null_checks: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.2. Page last updated on 2025-01-27. View source or report an issue.