将目录添加到 $LOAD_PATH (Ruby) [英] Adding a directory to $LOAD_PATH (Ruby)

问题描述

我见过两种常用的技术，用于将当前正在执行的文件的目录添加到 $LOAD_PATH(或 $:).我看到了这样做的好处，以防您不使用 gem.显然，一个似乎比另一个更冗长，但有理由选择一个吗?

I have seen two commonly used techniques for adding the directory of the file currently being executed to the $LOAD_PATH (or $:). I see the advantages of doing this in case you're not working with a gem. One seems more verbose than the other, obviously, but is there a reason to go with one over the other?

第一个冗长的方法(可能有点矫枉过正):

The first, verbose method (could be overkill):

$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__))) unless $LOAD_PATH.include?(File.expand_path(File.dirname(__FILE__)))

以及更直接、快速和肮脏的:

and the more straightforward, quick-and-dirty:

$:.unshift File.dirname(__FILE__)

有什么理由选择一个?

推荐答案

我会说使用 $:.unshift File.dirname(__FILE__) 而不是另一个，因为我已经看到它在代码中的使用比 $LOAD_PATH 多得多，而且它也更短！

I would say go with $:.unshift File.dirname(__FILE__) over the other one, simply because I've seen much more usage of it in code than the $LOAD_PATH one, and it's shorter too!

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