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SOLID principles are a set of design principles that help in creating maintainable and scalable software.
S - Single Responsibility Principle: A class should have only one reason to change.
O - Open-Closed Principle: Software entities should be open for extension but closed for modification.
L - Liskov Substitution Principle: Subtypes must be substitutable for their base types.
I - Interface Segregation Principle: Clients ...
Java 8 introduced several new concepts including lambda expressions, functional interfaces, streams, and default methods.
Lambda expressions enable functional programming and simplify code.
Functional interfaces are interfaces with a single abstract method, used for lambda expressions.
Streams provide a way to process collections of data in a functional and parallel manner.
Default methods allow adding new methods to exist...
collect is a method in Java 8 Stream API used to accumulate elements into a collection, while collections is a package in Java that provides various data structures and algorithms for working with collections.
collect is a method in Java 8 Stream API
collect is used to accumulate elements into a collection
collections is a package in Java
collections provides data structures and algorithms for working with collections
Multiple inheritance is not directly supported in Java, but it can be achieved using interfaces and abstract classes.
Java supports single inheritance, where a class can only extend one superclass.
To achieve multiple inheritance, we can use interfaces to define additional behaviors and abstract classes to provide common implementation.
A class can implement multiple interfaces, inheriting their methods and constants.
An a...
JPA Repository is an interface provided by Spring Data JPA that provides CRUD operations for working with databases.
JPA Repository is part of the Spring Data JPA framework.
It provides an abstraction layer for working with databases.
It allows developers to perform CRUD (Create, Read, Update, Delete) operations without writing SQL queries.
JPA Repository uses the Java Persistence API (JPA) to interact with the database.
It...
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I appeared for an interview before May 2021.
Round duration - 60 Minutes
Round difficulty - Easy
It was an coding round
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette.
Iterate through the buildings and create a list of critical points (x, y) where the height changes.
Sort the critical points based on x-coordinate and process them to form the skyline.
Merge consecutive horizontal segments of equal height into one to ensure no duplicates.
Return the fin...
You need to determine all possible paths for a rat starting at position (0, 0) in a square maze to reach its destination at (N-1, N-1). The maze is represented as an N*N ma...
Find all possible paths for a rat in a maze from source to destination.
Use backtracking to explore all possible paths in the maze.
Keep track of visited cells to avoid revisiting them.
Recursively try moving in all directions (up, down, left, right) until reaching the destination.
Return a list of strings representing valid paths sorted in alphabetical order.
Round duration - 30 Minutes
Round difficulty - Easy
It was an HR round with some general questions. it was just for formality.
Tip 1 : Stay focused
Tip 2 : Practice coding questions.
Tip 3 : View previous interviews of the companies
Tip 1 : Don't lie on resume
Tip 2 : Just write in format that is catchy
I applied via LinkedIn and was interviewed before May 2021. There were 2 interview rounds.
var, let, and const are all used to declare variables in JavaScript, but they have different scoping rules and behaviors.
var has function scope and can be redeclared and reassigned
let has block scope and can be reassigned but not redeclared
const has block scope and cannot be reassigned or redeclared
Use const for values that won't change, let for values that will, and avoid var
CSS box model defines the layout of elements on a webpage. Padding and margin can apply to block-level elements but not to inline elements.
CSS box model consists of content, padding, border, and margin around an element.
Padding adds space inside the border of an element.
Margin adds space outside the border of an element.
Padding and margin can apply to block-level elements like <div> but not to inline elements lik
Arrow functions are shorter syntax for writing function expressions.
Arrow functions do not have their own 'this' keyword.
Arrow functions cannot be used as constructors.
Arrow functions do not have the 'arguments' object.
Arrow functions are more concise and easier to read.
Regular functions are better for methods and constructors.
JavaScript asynchronous model allows non-blocking code execution by using callbacks and promises.
JavaScript uses an event loop to handle asynchronous operations.
Callbacks are functions passed as arguments to other functions and executed when the operation is complete.
Promises are objects that represent the eventual completion or failure of an asynchronous operation.
Async/await is a newer syntax that allows writing asyn...
I applied via Walk-in and was interviewed in Jun 2024. There was 1 interview round.
Python technical SQL basic
I applied via Naukri.com and was interviewed before Oct 2023. There was 1 interview round.
Check if a string is the same forwards and backwards
Iterate through the string from both ends and compare characters
Use built-in functions like reverse() to check for palindrome
Ignore spaces and punctuation when checking for palindrome
I applied via Job Portal and was interviewed before Nov 2023. There were 3 interview rounds.
Use a user table with a column for user type (free, gold, platinum)
Create a user table with columns for user ID, name, email, user type
Use a separate table for user types with columns for type ID and type name
Establish a one-to-many relationship between user and user type tables
Example: user table - user_id, name, email, type_id; user_type table - type_id, type_name
High-level design for a live rank dashboard for a live test with millions of users.
Use a scalable architecture to handle millions of users concurrently.
Implement real-time data processing to update ranks dynamically.
Utilize caching mechanisms to improve performance and reduce load on the database.
Design a user-friendly interface with intuitive data visualization.
Include features for filtering, sorting, and searching to
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
Two dynamic programming challenges at the hard level on LeetCode and 10 medium-level SQL challenge.
I applied via Recruitment Consulltant and was interviewed before Feb 2023. There was 1 interview round.
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