Flutter / Dart中单引号和双引号之间的区别 [英] Difference between single and double quotes in Flutter/Dart

问题描述

我知道单引号和双引号在Dart中至少具有某种程度的对等性。例如，

I know that single and double quotes have at least some level of equivelence in Dart. For example,

var myString = "Hello world";      // double quotes

和

var myString = 'Hello world';      // single quotes

据我所知没有程序上的区别。

have no programmatic difference to my knowledge.

我一直看到它们在各种示例和某些文档中似乎可以互换使用。我想知道我是否缺少细微的差别，或者是否有推荐的风格可以遵循，尤其是在Flutter中。

I keep seeing them used seemingly interchangeably in various examples and in some documentation. I'm wondering if there is a subtle difference that I am missing or if there is a recommended style to follow, especially in Flutter.

这是一个问答集。 ；阅读Flutter和Dart样式指南后的自我解答。

推荐答案

单引号和双引号都适用于Dart

Single and double quotes both work in Dart

final myString = 'hello';

与

final myString = "hello";

需要转义分隔符

使用 \ 反斜杠可在单引号字符串中转义单引号。

Delimiters need to be escaped

Use a \ backslash to escape single quotes in a single quote string.

final myString = 'Bob\'s dog';            // Bob's dog

用双引号将双引号转义也可以。

Same thing to escape double quotes in a double quote string.

final myString = "a \"quoted\" word";     // a "quoted" word

但如果分隔符不同，则无需转义任何内容。

But no need to escape anything if the delimiter is different.

final myString = "Bob's dog";             // Bob's dog
final myString = 'a "quoted" word';       // a "quoted" word

也无需担心传递给插值字符串的值。

Also no need to worry about the value passed into an interpolated string.

final value = '"quoted"';                 // "quoted"
final myString = "a $value word";         // a "quoted" word

在Flutter中首选单引号

Flutter样式指南建议对所有内容使用单引号

Prefer single quotes in Flutter

The Flutter style guide recommends using single quotes for everything

final myString = 'hello';

除了嵌套字符串

print('Hello ${name.split(" ")[0]}');

或包含单引号的字符串（可选）

or strings containing single quotes (optional)

final myString = "Bob's dog";
final myString = 'Bob\'s dog';  // ok

Dart样式指南在此问题上似乎保持沉默。

The Dart style guide appears to be silent on the issue.

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