And spacing / formatting in general. There are some details [here] but as a better practical illustration

```ruby
class MyClass
  def initialize
    some_var = :hi

    @collection.map do |arbitrary_object|
      # ...
    end

    something(some_var)
  end

  def something(passed_in)
    # ...
  end
end
```

line breaks between methods and blocks
except ... no line break between beginning of class and first method ... no line break after last method and end of class

[here]: https://github.com/thoughtbot/guides/tree/master/style#formatting