目录

no_self_assignments

目录

Don't assign a variable to itself.

此规则自 Dart 3.1 版本起可用。

详情

#

DON'T assign a variable to itself. Usually this is a mistake.

BAD:

dart
class C {
  int x;

  C(int x) {
    x = x;
  }
}

GOOD:

dart
class C {
  int x;

  C(int x) : x = x;
}

GOOD:

dart
class C {
  int x;

  C(int x) {
    this.x = x;
  }
}

BAD:

dart
class C {
  int _x = 5;

  int get x => _x;

  set x(int x) {
    _x = x;
    _customUpdateLogic();
  }

  void _customUpdateLogic() {
    print('updated');
  }

  void example() {
    x = x;
  }
}

GOOD:

dart
class C {
  int _x = 5;

  int get x => _x;

  set x(int x) {
    _x = x;
    _customUpdateLogic();
  }

  void _customUpdateLogic() {
    print('updated');
  }

  void example() {
    _customUpdateLogic();
  }
}

BAD:

dart
class C {
  int x = 5;

  void update(C other) {
    this.x = this.x;
  }
}

GOOD:

dart
class C {
  int x = 5;

  void update(C other) {
    this.x = other.x;
  }
}

使用方法

#

要启用 no_self_assignments 规则，请在你的 analysis_options.yaml 文件中，在 linter > rules 下添加 no_self_assignments ：

analysis_options.yaml
yaml
linter:
  rules:
    - no_self_assignments

除非另有说明，否则本网站上的文档反映的是 Dart 3.6.0。页面最后更新于 2025-02-05。 查看源代码 或 报告问题.