Ruby on Rails Guides (v4.2.5) - Incorrect information in 'Working with JavaScript in Rails' section

[atul-shimpi]

Information about how to call coffee script functions from event handler is not working as told in the guide.

2 Unobtrusive JavaScript

paintIt = (element, backgroundColor, textColor) ->
element.style.backgroundColor = backgroundColor
if textColor?
element.style.color = textColor

And then on our page:

Paint it red

painit is not getting called.
paintit needs to be delcared as @PaintIt
After that its getting called.
My rails ver - 4.2.3