prefer_final_in_for_each

Prefer final in for-each loop variable if reference is not reassigned.

此规则自 Dart 2.1 版本起可用。

此规则提供 快速修复 。

_不兼容规则：unnecessary_final _

DO prefer declaring for-each loop variables as final if they are not reassigned later in the code.

Declaring for-each loop variables as final when possible is a good practice because it helps avoid accidental reassignments and allows the compiler to do optimizations.

BAD:

for (var element in elements) { // LINT
  print('Element: $element');
}

GOOD:

for (final element in elements) {
  print('Element: $element');
}

GOOD:

for (var element in elements) {
  element = element + element;
  print('Element: $element');
}

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

linter:
  rules:
    - prefer_final_in_for_each

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.