cause the order in which you pass arguments
matters, it is usually best not to have helpers take more than one or
two of them.</p>
<p>That said, sometimes you may want to make behavior of helpers
configurable by the developers that call them from their templates. For
example, let's abandon our Americentric ways and update our
<code>format-currency</code> helper to take an optional configuration for which
currency symbol to display.</p>
<p>Helpers allow you to pass named arguments as a JavaScript
object that