What is the point of object.presence?

Question

In the Rails docs, the example provided for the object.presence method is:

region = params[:state].presence || params[:country].presence || \'US\'
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Answer 1

presence is very useful when you want to return nil if object is not present and the object itself if the object is present. In other words you want a code that looks like this:

object.present? object : nil

Instead of the line above you can simply call object.presence and the method will do the work for you.