</emu-note><pre><code class="javascript hljs"><span class="hljs-keyword">function</span> <span class="hljs-title function_">mapValues</span>(<span class="hljs-params">callbackFn, thisArg</span>) {
    <span class="hljs-title function_">assert</span>(<span class="hljs-title function_">isObject</span>(<span class="hljs-variable language_">this</span>), <span class="hljs-string">'this is not an object'</span>);
    <span class="hljs-title function_">assert</span>(<span class="hljs-title function_">isCallable</