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

As another example, presence lets me present my favorite FizzBuzz solution:

puts 1.upto(100).map { |n| "#{'Fizz' if n%3==0}#{'Buzz' if n%5==0}".presence || n }