is a helper that adds arguments to another function or callback</li>
</ul>
<p>This keeps the responsibilities clearly delineated, and makes it much easier to
reason about what each individual API is doing.</p>
</section>
<h2 id="toc_getting-used-to-action-on-and-fn">Getting used to <code>@action</code>, <code>{{on}}</code>, and <code>{{fn}}</code> <a href="#toc_getting-used-to-action-on-and-fn"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
        <path d="M326.61 185.4c59.75 59.8 58.93 155