check-if-object-instance-of-class

java

python

python3

mysql

mssql

oraclesql

csharp

javascript

typescript

bash

swift

kotlin

dart

golang

ruby

scala

rust

racket

erlang

elixir

pythondata

postgresql

cangjie

JavaScript

Write a function that checks if a given value&nbsp;is an instance of a given class or superclass. For this problem, an object is considered an instance of a given class if that object has access to that class&#39;s methods.

There are&nbsp;no constraints on the data types that can be passed to the function. For example, the value or the class could be&nbsp;<code>undefined</code>.

&nbsp;
Example 1:

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

Example 2:

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

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

Example 3:

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

Example 4:

<pre>
Input: func = () =&gt; checkIfInstanceOf(5, Number)
Output: true
Explanation: 5 is a Number. Note that the &quot;instanceof&quot; keyword would return false. However, it is still considered an instance of Number because it accesses the Number methods. For example &quot;toFixed()&quot;.
</pre>

checkIfInstance

Check if Object Instance of Class

请你编写一个函数，检查给定的值是否是给定类或超类的实例。

可以传递给函数的数据类型没有限制。例如，值或类可能是&nbsp; <code>undefined</code> 。

&nbsp;

示例 1：

<pre>
输入：func = () =&gt; checkIfInstance(new Date(), Date)
输出：true
解释：根据定义，Date 构造函数返回的对象是 Date 的一个实例。
</pre>

示例 2：

<pre>
输入：func = () =&gt; { class Animal {}; class Dog extends Animal {}; return checkIfInstance(new Dog(), Animal); }
输出：true
解释：
class Animal {};
class Dog extends Animal {};
checkIfInstanceOf(new Dog(), Animal); // true

Dog 是 Animal 的子类。因此，Dog 对象同时是 Dog 和 Animal 的实例。</pre>

示例 3：

<pre>
输入：func = () =&gt; checkIfInstance(Date, Date)
输出：false
解释：日期的构造函数在逻辑上不能是其自身的实例。
</pre>

示例 4：

<pre>
输入：func = () =&gt; checkIfInstance(5, Number)
输出：true
解释：5 是一个 Number。注意，"instanceof" 关键字将返回 false。</pre>