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<h1><a href="#eventapplier" name="eventapplier" class="anchor"><span class="anchor-link"></span></a>EventApplier</h1>
<pre class="prettyprint"><code class="language-scala">trait EventApplier[S, E] extends ((Option[S], E) => String \/ Option[S])
</code></pre>
<p>Application of an event on the entity state (aka. <em>folding</em> the events over the state) is defined with an <a href="api/core/endless/core/event/EventApplier.html" title="endless.core.event.EventApplier"><code>EventApplier</code></a> pure function, parametrized with the state <code>S</code> and events <code>E</code>. This is a tupled function of a possibly defined state and the event, leading to either a new version of the state or an error (<code>\/</code> is a type alias for <code>Either</code>).</p>
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