prefer_conditional_assignment

Prefer using ??= over testing for null.

PREFER using ??= over testing for null.

As Dart has the ??= operator, it is advisable to use it where applicable to improve the brevity of your code.

BAD:

String get fullName {
  if (_fullName == null) {
    _fullName = getFullUserName(this);
  }
  return _fullName;
}

GOOD:

String get fullName {
  return _fullName ??= getFullUserName(this);
}

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

linter:
  rules:
    - prefer_conditional_assignment

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

linter:
  rules:
    prefer_conditional_assignment: true

除非另有说明，文档之所提及适用于 Dart 3.7.2 版本，本页面最后更新时间: 2025-03-07。 查看文档源码 或者 报告页面问题。