no_leading_underscores_for_local_identifiers

Avoid leading underscores for local identifiers.

此规则自 Dart 2.16 版本起可用。

_规则集：recommended , flutter _

此规则提供 快速修复 。

DON'T use a leading underscore for identifiers that aren't private. Dart uses a leading underscore in an identifier to mark members and top-level declarations as private. This trains users to associate a leading underscore with one of those kinds of declarations. They see _ and think "private". There is no concept of "private" for local variables or parameters. When one of those has a name that starts with an underscore, it sends a confusing signal to the reader. To avoid that, don't use leading underscores in those names.

EXCEPTION:: An unused parameter can be named _, __, ___, etc. This is common practice in callbacks where you are passed a value but you don't need to use it. Giving it a name that consists solely of underscores is the idiomatic way to indicate that the value isn't used.

BAD:

void print(String _name) {
  var _size = _name.length;
  ...
}

GOOD:

void print(String name) {
  var size = name.length;
  ...
}

OK:

[1,2,3].map((_) => print('Hello'));

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

linter:
  rules:
    - no_leading_underscores_for_local_identifiers

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