63 interview questions for developers (2025)

14 votes1589 runs0 comment

Eric Hostaleryat Dec 3, 2021

11 votes734 runs0 comment

Samuelat Mar 28, 2022

9 votes752 runs0 comment

Samuelat Mar 28, 2022

9 votes606 runs0 comment

design pattern

8 votes1470 runs0 comment

Eric Hostaleryat Dec 3, 2021

5 votes1456 runs

Eric Hostaleryat Dec 3, 2021

5 votes738 runs0 comment

Samuelat Mar 28, 2022

4 votes1541 runs0 comment

design pattern

Eric Hostaleryat Sep 19, 2022

4 votes1507 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1455 runs0 comment

Eric Hostaleryat Dec 3, 2021

4 votes1414 runs1 comment

4 votes708 runs1 comment

operator overloading

Samuelat Mar 28, 2022

3 votes1488 runs0 comment

Eric Hostaleryat Dec 3, 2021

3 votes1478 runs0 comment

Eric Hostaleryat Mar 13, 2023

3 votes1453 runs1 comment

Eric Hostaleryat Dec 3, 2021

3 votes606 runs1 comment

access modifiers

Samuelat Mar 28, 2022

3 votes593 runs0 comment

Samuelat Mar 28, 2022

3 votes301 runs0 comment

polymorphism

encapsulation

Monemat Nov 3, 2023

2 votes1464 runs

Eric Hostaleryat Dec 3, 2021

2 votes645 runs0 comment

design pattern

Samuelat Mar 28, 2022

63 interview questionsfor developers (2025)

Test your developer skills before an interview with 63 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

63 interview questionsfor developers (2025)

Test your developer skills before an interview with 63 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Overrided method visibility must be the same or less restrictive than the inherited method.

Inheritance in OOP.

You need to develop a class for which there should be only one instance throughout your application. Which design pattern should you use for this?

Can we extend an abstract class in Java?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Can a class implements several interfaces ?

Which design pattern allows to dynamically add responsibilities to an object?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Can an interface inherit from another interface?

When can you do a+b in OOP ?

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

Implement the interface IEmailFormatter for the classes Person, Company, and ListOfPerson, which has a method GetEmailContent()

Implement the registration method on class A in a virtual way,Override the registration method on classes A1 and A2 when implementing these classes

What does the following code return ?

Explain the difference between overriding and overloading in OOP.

Inheritance, polymorphism and encapsulation

What are the public methods of the class `Person`?

How to instantiate objects with a type which is derivated from an abstract type in OOP