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

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+<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>