prefer_foreach

Use forEach to only apply a function to all the elements.

此规则自 Dart 2.0 版本起可用。

DO use forEach if you are only going to apply a function or a method to all the elements of an iterable.

Using forEach when you are only going to apply a function or method to all elements of an iterable is a good practice because it makes your code more terse.

BAD:

for (final key in map.keys.toList()) {
  map.remove(key);
}

GOOD:

map.keys.toList().forEach(map.remove);

NOTE: Replacing a for each statement with a forEach call may change the behavior in the case where there are side-effects on the iterable itself.

for (final v in myList) {
  foo().f(v); // This code invokes foo() many times.
}

myList.forEach(foo().f); // But this one invokes foo() just once.

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

linter:
  rules:
    - prefer_foreach

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.