This question is based on the fact that there exists two toString methods. One defined on Object.prototype and the other defined on Function.prototype.
References:
<ol>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString</a></li>
</ol>
Also note that
<pre class="shiki github-dark shaku"><code>typeof Function.prototype; // functiontypeof Object.protoype; // object</code></pre>
Now, if we try to access the toString method on an object, it will call Object.prototype.toString and when we access the toString method on a function, Function.prototype.toString will be called.
Interestingly, if we do
<pre class="shiki github-dark shaku"><code>delete Function.prototype.toString</code></pre>
the answer to all the console.logs in the quiz will be true since all functions will now move up the prototype chain in search of toString method and will find it on Object.prototype only.
<pre class="shiki github-dark shaku"><code>Object.getPrototypeOf(Function.prototype) === Object.prototype // true</code></pre>

Object.prototype.toString vs Function.prototype.toString

What does the code snippet to the right output by console.log?…