Ruby 中的字符串连接 [英] String concatenation in Ruby

问题描述

我正在寻找一种在 Ruby 中连接字符串的更优雅的方法.

I am looking for a more elegant way of concatenating strings in Ruby.

我有以下几行:

source = "#{ROOT_DIR}/" << project << "/App.config"

有没有更好的方法来做到这一点?

Is there a nicer way of doing this?

那么，<< 和 + 之间有什么区别?

And for that matter what is the difference between << and +?

推荐答案

您可以通过多种方式做到这一点:

You can do that in several ways:

1. 正如你用 << 展示的那样，但这不是通常的方式

2. 带字符串插值

1. As you shown with << but that is not the usual way

2. With string interpolation

source = "#{ROOT_DIR}/#{project}/App.config"

与 +

source = "#{ROOT_DIR}/" + project + "/App.config"

从我所看到的(虽然没有测量)，第二种方法在内存/速度方面似乎更有效.当 ROOT_DIR 为 nil 时，这三种方法都会抛出未初始化的常量错误.

The second method seems to be more efficient in term of memory/speed from what I've seen (not measured though). All three methods will throw an uninitialized constant error when ROOT_DIR is nil.

在处理路径名时，您可能需要使用 File.join 以避免弄乱路径名分隔符.

When dealing with pathnames, you may want to use File.join to avoid messing up with pathname separator.

归根结底，这是一个品味问题.

In the end, it is a matter of taste.

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