one_member_abstracts

Avoid defining a one-member abstract class when a simple function will do.

此规则自 Dart 2.0 版本起可用。

From Effective Dart:

AVOID defining a one-member abstract class when a simple function will do.

Unlike Java, Dart has first-class functions, closures, and a nice light syntax for using them. If all you need is something like a callback, just use a function. If you're defining a class and it only has a single abstract member with a meaningless name like call or invoke, there is a good chance you just want a function.

BAD:

abstract class Predicate {
  bool test(item);
}

GOOD:

typedef Predicate = bool Function(item);

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

linter:
  rules:
    - one_member_abstracts

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.