ValueLabs Module Lead Software Developer Interview Questions and Answers

Object-oriented programming concepts that focus on data encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation detai...read more

super is used to refer immediate parent class instance variable or method, while this is used to refer current class instance variable or method.

• super is used to access parent class members, while this is used to access current class members

• super keyword is used to invoke parent class constructor, while this keyword is used to invoke current class constructor

• super keyword is used to differentiate between parent and chi...read more

Sort a given string array in alphabetical order

• Use a sorting algorithm like quicksort or mergesort

• Consider using built-in sorting functions in programming languages

• Ensure the sorting is case-sensitive unless specified otherwise

Microservice design patterns are architectural patterns that help in designing and implementing microservices.

• Service Decomposition

• API Gateway

• Service Registry

• Circuit Breaker

• Saga Pattern

I am an experienced Module Lead with expertise in Automation framework design and end-to-end testing activities.

• I have designed and implemented automation frameworks using tools like Selenium and Appium.

• I have experience in creating reusable components, libraries, and utilities for automation.

• I have conducted end-to-end testing activities including test planning, execution, and reporting.

• I have worked on continuous int...read more

Event loop is a mechanism in programming that allows for asynchronous execution of code by managing the order of operations.

• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It allows for non-blocking I/O operations by continuously checking the event queue for tasks to execute.

• Event loop ensures that tasks are executed in the order they were added to the queue.

• Example: setTimeout() function in...read more

Callback hell is a situation in asynchronous programming where multiple nested callbacks make the code difficult to read and maintain.

• Occurs when multiple asynchronous operations are nested within each other

• Leads to deeply nested code structure which is hard to understand and maintain

• Can be avoided by using promises, async/await, or libraries like async.js

A program to find if a given string is a palindrome or not.

• Create a function that takes a string as input

• Reverse the string and compare it with the original string

• If they are the same, then the string is a palindrome