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I applied via Company Website and was interviewed before Feb 2023. There were 4 interview rounds.
Closure is a feature in programming languages that allows a function to access variables from its outer scope even after it has finished executing.
Closure is created when a nested function references variables from its parent function.
It allows for data encapsulation and privacy in JavaScript.
Closures are commonly used in event handlers, callbacks, and asynchronous programming.
They can be used to create private variabl...
JS hoisting is a mechanism where variable and function declarations are moved to the top of their scope during compilation.
Variable declarations are hoisted but not their initializations.
Function declarations are fully hoisted, including their definitions.
Hoisting can lead to unexpected behavior if not understood properly.
Example: console.log(x); var x = 5; // Output: undefined
CSS position properties determine how an element is positioned on a web page.
static: default position, elements flow in document order
relative: positioned relative to its normal position
absolute: positioned relative to its nearest positioned ancestor
fixed: positioned relative to the browser window
sticky: positioned based on scroll position
React has several component lifecycles, including mounting, updating, and unmounting.
Mounting: when a component is being created and inserted into the DOM
Updating: when a component is being re-rendered due to changes in props or state
Unmounting: when a component is being removed from the DOM
Ref is used in React to access and manipulate the DOM directly.
Ref provides a way to access and modify DOM elements or React components.
It is commonly used for focusing input fields, triggering animations, or integrating with third-party libraries.
Ref can be created using the useRef() hook or by using the ref attribute in class components.
Example: const inputRef = useRef();
Example: const button
Designing the database for Slack
Create tables for users, channels, messages, and teams
Use foreign keys to establish relationships between tables
Include columns for user details, channel details, message content, and timestamps
Consider indexing frequently queried columns for performance optimization
To improve db performance, optimize queries, use indexing, cache data, and scale horizontally.
Optimize queries by using appropriate indexes and avoiding unnecessary joins
Cache frequently accessed data to reduce database load
Scale horizontally by distributing the database across multiple servers
Use database monitoring tools to identify and resolve performance bottlenecks
CDN stands for Content Delivery Network. It is a distributed network of servers that helps deliver web content efficiently.
CDN improves website performance by caching content closer to the user
It reduces latency and improves page load times
CDN helps handle high traffic loads and prevents server overload
It provides global coverage and ensures content availability worldwide
CDN can deliver various types of content like im...
To improve API latency, optimize database queries, use caching, implement load balancing, and optimize code.
Optimize database queries by using indexes, reducing unnecessary joins, and optimizing query execution plans.
Implement caching to store frequently accessed data in memory, reducing the need for repeated database queries.
Use load balancing to distribute incoming requests across multiple servers, preventing any sin...
posted on 11 Jul 2022
I applied via Campus Placement
posted on 22 Nov 2024
I applied via Campus Placement and was interviewed in Oct 2024. There were 2 interview rounds.
Reasoning , maths , coding, english
Java python css c programming sql, html.
posted on 9 Dec 2024
MCQ - 20 (aptitude), 20(c+ and sql)
Pattern, array and sql questions
posted on 14 Jun 2024
I applied via LinkedIn and was interviewed before Oct 2023. There were 2 interview rounds.
Giva a Full stack project. based on MERN AND MEAN stack
I applied via LinkedIn and was interviewed before Jun 2023. There were 2 interview rounds.
Oops concept in C# refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
Inheritance allows a class to inherit properties and behavior from another class.
Encapsulation hides the internal state of an object and only exposes necessary information.
Polymorphism allows objects of different classes to be treated as objects of a common superclass.
Abstraction focuses on...
A filter is a tool used to select specific data from a larger set based on certain criteria.
Filters can be used in various programming languages and databases to narrow down results.
Types of filters include text filters, numeric filters, date filters, and custom filters.
Examples of filters include WHERE clause in SQL, filter() function in Python, and filter() method in JavaScript.
A view in SQL Server is a virtual table that contains the result set of a SELECT statement.
Views are used to simplify complex queries by storing them as a virtual table.
Views can be used to restrict access to specific columns or rows of a table.
Views can be created using the CREATE VIEW statement.
Example: CREATE VIEW vwEmployee AS SELECT FirstName, LastName FROM Employees;
Primary key uniquely identifies a record in a table, while unique key ensures uniqueness but allows null values.
Primary key enforces uniqueness and not null constraint on a column
Primary key can consist of multiple columns
Unique key enforces uniqueness but allows null values
Unique key can be applied to multiple columns as well
Procedures are a set of instructions that perform a specific task, while functions return a value after performing a task.
Procedures do not return a value, while functions do.
Functions can be called within expressions, while procedures cannot.
Functions are more versatile and reusable compared to procedures.
A trigger in SQL Server is a special type of stored procedure that automatically executes when certain events occur in a database.
Triggers can be used to enforce business rules, audit changes, or replicate data.
There are two main types of triggers in SQL Server: DML triggers and DDL triggers.
DML triggers fire in response to data manipulation language (DML) events like INSERT, UPDATE, and DELETE.
DDL triggers fire in res...
Interface in C# is a reference type that defines a contract for classes to implement certain methods and properties.
Interfaces cannot have implementation, only method signatures and properties.
Classes can implement multiple interfaces in C#.
Interfaces are used to achieve abstraction and multiple inheritance in C#.
Example: public interface IShape { void Draw(); }
Example: public class Circle : IShape { public void Draw()
Abstract class is a class that can have both abstract and non-abstract methods, while interface is a contract that defines methods that must be implemented by a class.
Abstract class can have constructor, fields, and methods, while interface cannot have any implementation.
A class can implement multiple interfaces but can only inherit from one abstract class.
Abstract classes are used when some common functionality needs ...
Partial view in ASP.NET MVC allows reusing common UI elements across multiple views.
Partial views are like reusable components that can be included in multiple views
They help in reducing code duplication and improving maintainability
Partial views are rendered using Html.Partial or Html.RenderPartial methods
Method overloading is having multiple methods in the same class with the same name but different parameters. Method overriding is redefining a method in a subclass with the same name and parameters as in the superclass.
Method overloading involves multiple methods with the same name but different parameters.
Method overriding involves redefining a method in a subclass with the same name and parameters as in the superclas...
Union combines and removes duplicates, while union all combines all rows including duplicates.
Union removes duplicates, while union all includes duplicates.
Union is slower as it has to remove duplicates, while union all is faster.
Use union when you want to remove duplicates, use union all when duplicates are acceptable.
Foreign key in SQL is a field in a table that links to a primary key in another table, enforcing referential integrity.
Foreign key constraints ensure data consistency between related tables
Foreign key values must exist in the referenced table's primary key column
Foreign key can be used to establish relationships between tables
Constructor in C# is a special type of method that is automatically called when an instance of a class is created.
Constructors have the same name as the class and do not have a return type.
They can be used to initialize the data members of the class.
Constructors can be overloaded to have multiple versions with different parameters.
Example: public class Person { public Person(string name) { this.Name = name; } }
SQL statements are used to interact with databases by performing operations like querying, updating, and deleting data.
SQL statements are made up of keywords like SELECT, INSERT, UPDATE, DELETE, etc.
They are structured in a specific order, with clauses like WHERE, ORDER BY, GROUP BY, etc.
Tables are referenced using their names, and conditions are specified to filter data.
Joins can be used to combine data from multiple
posted on 5 Aug 2023
I applied via Naukri.com and was interviewed in Feb 2023. There were 4 interview rounds.
Basic questions like reverse a number, print Fibonacci series, character replacement
One approach is to calculate the sum of all numbers in the set and then subtract the sum of the given numbers to find the missing number.
Calculate the sum of all numbers in the set using the formula n*(n+1)/2, where n is the total number of elements in the set.
Calculate the sum of the given numbers in the set.
Subtract the sum of the given numbers from the sum of all numbers to find the missing number.
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