leetcode-problemset/leetcode/problem/check-if-object-instance-of-class.html

<p>Write a function that checks if a given object is an instance of a given class or superclass.</p>

<p>There are&nbsp;no constraints on the data types that can be passed to the function.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> func = () =&gt; checkIfInstance(new Date(), Date)
<strong>Output:</strong> true
<strong>Explanation: </strong>The object returned by the Date constructor is, by definition, an instance of Date.
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> func = () =&gt; { class Animal {}; class Dog extends Animal {}; return checkIfInstance(new Dog(), Animal); }
<strong>Output:</strong> true
<strong>Explanation:</strong>
class Animal {};
class Dog extends Animal {};
checkIfInstance(new Dog(), Animal); // true

Dog is a subclass of Animal. Therefore, a Dog object is an instance of both Dog and Animal.</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> func = () =&gt; checkIfInstance(Date, Date)
<strong>Output:</strong> false
<strong>Explanation: </strong>A date constructor cannot logically be an instance of itself.
</pre>

<p><strong class="example">Example 4:</strong></p>

<pre>
<strong>Input:</strong> func = () =&gt; checkIfInstance(5, Number)
<strong>Output:</strong> true
<strong>Explanation: </strong>5 is a Number. Note that the &quot;instanceof&quot; keyword would return false.
</pre>