ruby - Ruby 中的 include 和 require 有什么区别？

Question

我的问题类似于“What is the difference between include and extend in Ruby?”。

Ruby 中的 require 和 include 有什么区别？如果我只是想在我的类中使用模块中的方法，我应该require 还是include？

Answer 1

What's the difference between "include" and "require" in Ruby?

Answer:

The include and require methods do very different things.

The require method does what include does in most other programming languages: run another file. It also tracks what you've required in the past and won't require the same file twice. To run another file without this added functionality, you can use the load method.

The include method takes all the methods from another module and includes them into the current module. This is a language-level thing as opposed to a file-level thing as with require. The include method is the primary way to "extend" classes with other modules (usually referred to as mix-ins). For example, if your class defines the method "each", you can include the mixin module Enumerable and it can act as a collection. This can be confusing as the include verb is used very differently in other languages.

Source

因此，如果您只想使用一个模块，而不是扩展它或进行混合，那么您将需要使用 require。

奇怪的是，Ruby 的require 类似于C 的include，而Ruby 的include 几乎与C 的include 完全不同>.