</span>(<span class="hljs-params">firstName, lastName</span>) </span>{
    <span class="hljs-comment">// initialize reactive properties on a new instance</span>
    extendReactive(<span class="hljs-keyword">this</span>, {
        firstName: firstName,
        lastName: lastName
    });
}

<span class="hljs-keyword">var</span> matthew = <span class="hljs-keyword">new</span> Person(<span class="hljs-string">&quot;Matthew&quot;</span>, <span class="hljs-string">&quot;Henry&quot;</span>);

<span class="hljs-com