31 lines
731 B
Markdown
31 lines
731 B
Markdown
|
---
|
|||
|
|
title: Ruby String Interpolation
|
|||
|
|
localeTitle: Ruby String Interpolation
|
|||
|
|
---
|
|||
|
|
# 字符串插值
|
|||
|
|
|
|||
|
|
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：
|
|||
|
|
|
|||
|
|
```ruby
|
|||
|
|
"Hello " + "World!" #=> Hello World
|
|||
|
|
"Hello " << "World!" #=> Hello World
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
字符串插值提供了一种将Ruby代码直接嵌入字符串的方法：
|
|||
|
|
|
|||
|
|
```ruby
|
|||
|
|
place = "World"
|
|||
|
|
"Hello #{place}!" #=> Hello World!
|
|||
|
|
|
|||
|
|
"4 + 4 is #{4 + 4}" #=> 4 + 4 is 8
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
`#{`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。
|
|||
|
|
|
|||
|
|
单引号将返回引号内的确切字符串：
|
|||
|
|
|
|||
|
|
```ruby
|
|||
|
|
place = "World"
|
|||
|
|
'Hello #{place}!' #=> Hello #{place}!
|
|||
|
|
|
|||
|
|
```
|