奇怪的Ruby语法？ [英] Strange Ruby Syntax?

问题描述

 <$ c我在ruby-lang.org上做了Ruby 20分钟的教程，并且遇到了这个代码搞乱了irb：
 $ C> IRB（主）：015：0> def h（name）
 irb（main）：016：1>放入Hello＃{name}！ 
 irb（main）：017：1>结束
  

根据解释，＃{name} 部分只是将该变量添加到字符串？我认为这是一种奇怪而冗长的写作方式，所以我只是认为我会尝试Hello+ name ，它的工作方式完全一样。

我试图找到＃{} 的含义，我无法找到任何有关它的内容，所以我想我' d问社区..有什么区别？是否有一个？

感谢您的提前！

解决方案

+ 比较容易，但是在这种情况下，您离开感叹号。考虑：

  putsHello＃{name}！ 
  

vs。

 放入Hello+名称+！ 
  

我发现第一个更具可读性，尤其是在字符串中多次使用时。 b
$ b

另外考虑在第二个版本的Hello后面留出空间是多么容易：

 放入你好+名字+！ 
  

很容易编写，但可能不是您的意思。

最后，当您插入的内容不是字符串时，它会产生更大的差异：

 得分者是＃{姓名}，得分为＃{分数}！ 
  

顺便说一句，搜索字符串插值可能会使搜索更容易，而不仅仅是搜索为语法。

I'm doing the Ruby 20 minute tutorial on ruby-lang.org and I came across this code messing with the irb:

irb(main):015:0> def h(name)
irb(main):016:1> puts "Hello #{name}!"
irb(main):017:1> end

based on the explanation, the #{name} part is just adding the variable to the string? I thought this was an odd and verbose way of writing it so I just thought I'd try "Hello" + name and it worked exactly the same way..

I googled around trying to find a meaning to #{} and I cant find anything talking about it so I thought I'd ask the community.. what is the difference? Is there one?

Thanks in advance!

解决方案

Sometimes using + is easier, but in this case you left off the exclamation point. Consider:

puts "Hello #{name}!"

vs.

puts "Hello " + name + "!"

I find the first more readable, especially when used several times in a string.

Also consider how easy it was to leave out the space after "Hello" in the second version:

puts "Hello" + name + "!"

is easy to write, but probably isn't what you mean.

Last, it makes an even bigger difference when what you're interpolating isn't a string:

puts "The Winner was #{name} with a score of #{score}!"

By the way, searching for "string interpolation" will probably make it easier to find things than just searching for the syntax.

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