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] =&gt; sub {...};</pre>

<p>On a bad <code>age</code> parameter, it will print out the following warning:</p>
<pre class="prettyprint">Parameter age from query failed checking for type Int, called action SoftError</pre>

<p>This means you can also register a set of actions that you want to call
in different cases.</p>
<h2><a name="conclusion"></a>Conclusion</h2>

<p><a href="https://metacpan.org/module/Dancer2::Plugin::ParamTypes">Dancer2::Plugin::ParamTypes</a> allows you to define your own types and
your own actions, to create your own plugin that helps you maintain
reusability and consistency across your application with fewer code
duplication and less effort.</p>
<h2><a name="author"></a>Author</h2>

<p>This article has been written by Sawyer X for the Perl
Dancer Advent Calendar 2018.</p>
<h2><a name="copyright"></a>Copyright</h2>

<p>No copyright retained. Enjoy.</p>
<p>2018 // Sawyer X <code>&lt;xsawyerx@cpan.org&gt;</code></p>
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