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test_types_in_equals

稳定版

测试 operator ==(Object other) 中参数的类型。

详情

#

应该operator ==(Object other) 中测试参数的类型。

不测试类型可能会导致运行时类型错误,这对您的类的使用者来说是意想不到的。

不良示例

dart
class Field {
}

class Bad {
  final Field someField;

  Bad(this.someField);

  @override
  bool operator ==(Object other) {
    Bad otherBad = other as Bad; // LINT
    bool areEqual = otherBad != null && otherBad.someField == someField;
    return areEqual;
  }

  @override
  int get hashCode {
    return someField.hashCode;
  }
}

良好示例

dart
class Field {
}

class Good {
  final Field someField;

  Good(this.someField);

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    return other is Good &&
        this.someField == other.someField;
  }

  @override
  int get hashCode {
    return someField.hashCode;
  }
}

启用

#

要启用 test_types_in_equals 规则,请在您的 analysis_options.yaml 文件中的 linter > rules 下添加 test_types_in_equals

analysis_options.yaml
yaml
linter:
  rules:
    - test_types_in_equals

如果您改为使用 YAML 映射语法来配置 linter 规则,请在 linter > rules 下添加 test_types_in_equals: true

analysis_options.yaml
yaml
linter:
  rules:
    test_types_in_equals: true