<<DESC 在 ruby 中是什么意思? [英] What does <<DESC mean in ruby?
问题描述
我正在学习Ruby，在我使用的书中，有这样的示例代码
I am learning Ruby, and in the book I use, there is an example code like this
#...
restaurant = Restaurant.new
restaurant.name = "Mediterrano"
restaurant.description = <<DESC
One of the best Italian restaurants in the Kings Cross area,
Mediterraneo will never leave you disappointed
DESC
#...
有人可以向我解释一下上面示例中 <<DESC 的含义吗?它和普通的字符串双引号有什么区别?
Can someone explain to me what <<DESC means in the above example? How does it differ from the common string double quote?
推荐答案
用于创建多行字符串.基本上，'<<DESC' 告诉 ruby 考虑接下来的所有内容，直到下一个 'DESC' 关键字.DESC"不是强制性的，因为它可以用其他任何东西代替.
It is used to create multiline strings. Basically, '<< DESC' tells ruby to consider everything that follows until the next 'DESC' keyword. 'DESC' is not mandatory, as it can be replaced with anything else.
a = <<STRING
Here
is
a
multiline
string
STRING
<<运算符后跟一个标识符，用于标记文档的结尾.结束标记称为终止符.终止符之前的文本行连接在一起，包括换行符和任何其他空格.http://en.wikibooks.org/wiki/Ruby_Programming/Here_documents
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