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The instanceof Operator in OOP in JavaScript

The instanceof operator allows you to check whether an object belongs to a certain class. Let's look at an example. Let's say we have the following class:

class User { }

Let's make an object of this class:

let user = new User;

Let's check if the object from the variable belongs to our class:

console.log(user instanceof User); // true

Determine what the result of executing the following code will be:

class Student { } class Employee { } let employee = new Employee; console.log(employee instanceof Employee); console.log(employee instanceof Student);

The following code is given:

class Student { constructor(name) { this.name = name; } } class Employee { constructor(name) { this.name = name; } } let users = [ new Student('user1'), new Employee('user2'), new Student('user3'), new Employee('user4'), new Student('user5'), new Employee('user6'), new Student('user7'), ];

Loop through the array of objects and output only the names of the employees to the console.

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