Dart字符串前面的@是什么意思

Question

我发现一些 Dart 代码在字符串前面带有 @：

_specialCharactersInsideCharacterClass = new HashSet.from([@"^", @"-", @"]"]);

发现于：RegExpBuilder.dart

在这种情况下符号@是什么意思？

Answer 1

现在，字符串前面的前缀 @ 字符不是有效的 Dart 代码。但我可以想象它被用来禁用转义和字符串插值 in the past. The linked Dart file is from 2013, so maybe it was created before the prefix r was introduced to mark raw strings:

_specialCharactersInsideCharacterClass = new HashSet.from([r"^", r"-", r"]"]);

在原始字符串中，字符串插值（使用 $ 字符）和转义（例如 \r）被禁用。

Dart字符串前面的@是什么意思

What does @ in front of a Dart string mean

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