ed when <code>title</code> is updated, not when <code>slug</code> is read.</p>
<p>It&#39;s of course also possible to compute properties based on multiple streams:</p>
<pre><code class="language-javascript">var firstName = stream(&quot;John&quot;)
var lastName = stream(&quot;Doe&quot;)
var fullName = stream.merge([firstName, lastName]).map(function(values) {
    return values.join(&quot; &quot;)
})

console.log(fullName()) // logs &quot;John Doe&quot;

firstName(&quot;Mary&quot;)

console.log(fullName()) //