<blockquote>
<p><a href="http://www.stroustrup.com/glossary.html#Gpolymorphism">Polymorphism</a>
- the provision of a single interface to entities of different types</p>
</blockquote>

<p>Polymorphism is one of the fundamental features of object oriented programming, but what
exactly does it mean? At its core, in Ruby, it means being able to send…</p>

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