10+ Samsung Research Interview Questions and Answers

System design in Node.js involves applying SOLID principles and design patterns for scalable and maintainable applications.

• Use SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion) to design modular and flexible systems.

• Apply design patterns like MVC, Factory, Singleton, Observer, etc. to address common design problems and improve code reusability.

• Utilize Node.js features like event-driven architecture, non-blo...read more

Remove subsequent repetitions in a string

• Iterate through the string and compare each character with the next one

• If they are the same, remove the repetition by shifting the characters to the left

• Repeat this process until all repetitions are eliminated

Unit test for a service class

• Create a test class for the service class

• Mock any dependencies of the service class

• Write test methods to cover different scenarios

• Use assertions to verify the expected outcomes

Selenium architecture involves WebDriver, WebElement, and Browser Drivers. Java collections hierarchy includes List, Set, Map interfaces.

• Selenium architecture includes WebDriver, WebElement, and Browser Drivers

• WebDriver acts as the main interface to interact with web browsers

• WebElement represents elements on a web page that can be interacted with

• Browser Drivers are used to communicate with specific web browsers

• Java collections hierarchy includes List, Set, and Map interfaces

• L...read more

Inheritance in software development allows a class to inherit properties and behaviors from another class.

• Inheritance allows a subclass to reuse code from a superclass

• Subclass can also add new functionalities or override existing ones

• Example: Animal class can be a superclass with properties like name and age, while Dog class can inherit from Animal and add a method bark()

A URL shortener is a tool that takes a long URL and generates a shorter, more manageable link.

• Generate a unique short code for each long URL

• Store the mapping between short code and long URL in a database

• Redirect users from short URL to original long URL when accessed

Overloading is a concept in programming where multiple functions can have the same name but different parameters.

• Functions with the same name but different parameters can be defined in a class

• Overloading allows for flexibility in function usage

• Example: void print(int num) and void print(string text) are overloaded functions

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Examples include function overloading, operator overloading, and inheritance.

• Polymorphism helps in creating reusable and flexible code.

INVEST is a set of criteria used to evaluate user stories in Agile development.

• INVEST stands for Independent, Negotiable, Valuable, Estimable, Small, and Testable.

• Each user story should be independent from others, negotiable in terms of details, valuable to the customer, estimable in terms of effort, small enough to be completed in a single iteration, and testable to ensure quality.

• For example, a user story like 'As a user, I want to be able to reset my password' would meet t...read more

Function overriding is a feature in object-oriented programming where a subclass provides a different implementation of a method that is already defined in its superclass.

• Function overriding is used to achieve polymorphism in OOP.

• The method signature of the overridden method in the subclass must match that of the superclass.

• The access level of the overridden method in the subclass cannot be more restrictive than that of the superclass.

• Example: A superclass Animal has a method...read more