title: What is the point of Object#presence in Rails?
body: <p>In the Rails docs, <a href="http://api.rubyonrails.org/classes/Object.html#method-i-presence" rel="nofollow noreferrer">the example provided</a> for the <code>Object#presence</code> method is:</p>
  <pre><code>region = params[:state].presence || params[:country].presence || 'US'
  </code></pre>
  <p>But isn't that just equivalent to:</p>
  <pre><code>region = params[:state] || params[:country] || 'US'
  </code></pre>
  <p>What is the point of using <code>presence</code>?</p>