avoid_double_and_int_checks

Avoid double and int checks.

AVOID to check if type is double or int.

When compiled to JS, integer values are represented as floats. That can lead to some unexpected behavior when using either is or is! where the type is either int or double.

BAD:

f(num x) {
  if (x is double) {
    ...
  } else if (x is int) {
    ...
  }
}

GOOD:

f(dynamic x) {
  if (x is num) {
    ...
  } else {
    ...
  }
}

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

linter:
  rules:
    - avoid_double_and_int_checks

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

linter:
  rules:
    avoid_double_and_int_checks: 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.