31 lines
731 B
Markdown
31 lines
731 B
Markdown
---
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title: Ruby String Interpolation
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localeTitle: Ruby String Interpolation
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---
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# 字符串插值
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字符串插值为构建字符串提供了更易读和简洁的语法。您可能熟悉通过`+`或`<<`方法连接：
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```ruby
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"Hello " + "World!" #=> Hello World
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"Hello " << "World!" #=> Hello World
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```
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字符串插值提供了一种将Ruby代码直接嵌入字符串的方法：
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```ruby
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place = "World"
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"Hello #{place}!" #=> Hello World!
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"4 + 4 is #{4 + 4}" #=> 4 + 4 is 8
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```
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`#{`和`}`之间的所有内容都被评估为Ruby代码。为此，字符串必须用双引号（ `"` ）括起来。
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单引号将返回引号内的确切字符串：
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```ruby
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place = "World"
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'Hello #{place}!' #=> Hello #{place}!
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``` |