unnecessary_final

Don't use final for local variables.

此规则自 Dart 2.7 版本起可用。

此规则提供 快速修复 。

_不兼容规则：prefer_final_locals , prefer_final_parameters , prefer_final_in_for_each _

Use var, not final, when declaring local variables.

Per Effective Dart, there are two styles in wide use. This rule enforces the var style. For the alternative style that prefers final, enable prefer_final_locals and prefer_final_in_for_each instead.

For fields, final is always recommended; see the rule prefer_final_fields.

BAD:

void badMethod() {
  final label = 'Final or var?';
  for (final char in ['v', 'a', 'r']) {
    print(char);
  }
}

GOOD:

void goodMethod() {
  var label = 'Final or var?';
  for (var char in ['v', 'a', 'r']) {
    print(char);
  }
}

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

linter:
  rules:
    - unnecessary_final

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.