Why do rails use the .js.coffee extension for coffeescript files when they cannot contain javascript code?

Question

I found this to be quite misleading, as I thought it suggested that such files might include a mixture of javascript and coffeescript code. Is there something very important that I am missing?

Answer 1

It is common practice in Rails templates have extensions such as .js.coffee, .html.erb, .html.haml, etc.

If I remember correctly, Rails interprets these extensions as .[format].[builder]it uses this knowledge to do two things:

• [format], , Accept;
• [builder] .

Answer 2

javascript, .

- `function(){ do something };` .