多个文件扩展名有什么影响？

Question

I use Ruby on Rails and Uglify, which allows me to code in Coffeescript. So both of these file extensions are valid:

#1 file.coffee
#2 file.js.coffee

Would I be creating potential problems for myself by only using style #1? Is the .js necessary at any point from compiling to running on, for example, Heroku (or some other web server)?

I believe I read somewhere that Rails only looks at the last file extension and treats it accordingly. But I am wondering if there are any drawbacks to anything by not including .js .

Ultimately, what is the effect of multiple file extensions?

Answer 1

This convention is usually followed for Rails templates. Other examples are .html.erb and .html.haml . This conforms to the format .[format].[builder] . What you will notice is that these files will have a mixture of code. For instance, .js.coffee would have both Javascript and Coffeescript.

But ultimately, the [format] part of it is used to find the appropriate template to use and the [builder] part denotes which template processor to use.