Instance variables that start with `@_` [closed]

Question

What is the purpose of making instance variables start with an underscore like the following?

@_variables_name

Answer 1

Ruby does not have a special interpretation of instance variables that start with an underscore, like PHP has a special meaning for vars that start and end with double underscores (e.g. __FILE__).

So, @_instance_var has no special meaning. Rails internally uses it to distinguish private/protected variables that other should not modify/access.

But, there is no community-wide convention yet. So, you can use the Rail's convention or make up your own use for that.