Appventurez Full Stack Developer Interview Questions and Answers

Q1. Event Loop in jS
Ans. 
Event Loop in JavaScript manages the execution of multiple tasks in a single-threaded environment.
• Event Loop is responsible for handling asynchronous operations in JavaScript.

• It continuously checks the call stack and the task queue, moving tasks from the queue to the stack when the stack is empty.

• Tasks like setTimeout, setInterval, and AJAX requests are handled by the Event Loop.

• Event Loop ensures that JavaScript remai
Answered by AI
Add your answer
Q2. Sharding in Node js
Ans. 
Sharding in Node.js involves splitting a database into smaller parts to improve performance and scalability.
• Sharding is a technique used to horizontally partition data across multiple servers or databases.

• It helps distribute the load evenly and improves performance by allowing parallel processing of queries.

• In Node.js, sharding can be implemented using libraries like MongoDB's sharding feature or custom sharding logic
Answered by AI
Add your answer
Q3. Indexing in Node js
Ans. 
Indexing in Node.js is a way to optimize data retrieval by creating indexes on specific fields in a database.
• Indexing in Node.js can be done using libraries like Mongoose for MongoDB databases.

• Indexes can improve query performance by allowing the database to quickly locate the requested data.

• Example: Creating an index on a 'username' field in a user collection can speed up queries searching for a specific user.
Answered by AI
Add your answer

Q1. How abstraction and inheritance are related?
Ans. 
Abstraction allows for defining a common interface for related objects, while inheritance enables a class to inherit attributes and methods from another class.
• Abstraction involves hiding the implementation details and showing only the necessary features of an object. Inheritance allows a class to inherit properties and behaviors from another class.

• Abstraction helps in creating a blueprint of a class without providing t...read more
Answered by AI
Add your answer
Q2. Given a perticular time, find the angle between hour hand and minute hand.
Ans. 
To find the angle between hour and minute hand at a given time on a clock face.
• Calculate the angle made by hour hand with 12:00 on the clock face

• Calculate the angle made by minute hand with 12:00 on the clock face

• Find the absolute difference between the two angles

• If the angle is greater than 180 degrees, subtract it from 360 degrees for the acute angle
Answered by AI
Add your answer

Q1. Regrading Self join query
Ans. 
A self join query is used to join a table to itself in a SQL query.
• Self join is used when a table needs to be joined with itself to compare rows within the same table.

• It requires aliasing the table with different names to distinguish between the two instances of the same table.

• Commonly used in hierarchical data structures or when comparing related rows in a table.
Answered by AI
Add your answer
Q2. Group by query per catagory
Ans. 
Group by query is used to group data based on a specific category.
• Use the GROUP BY clause in SQL to group data based on a specific column

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to perform calculations on grouped data

• Example: SELECT category, COUNT(*) FROM products GROUP BY category
Answered by AI
Add your answer

Q1. I don't know why they rejected me
Add your answer
Q2. What ever they asked me for coding part the output is correct and logic is also correct
Add your answer

Quantitative arithmetic,verbal reasoning,non-verbal reasoning,etc

Q1. Java related question
Add your answer
Q2. Web services related question
Add your answer

Q1. Project related question
Add your answer

Good and easy most of the question are reapeted

Arrays, string, constructors in basic to medium level

Q1. Questions based on the resume in technical way
Add your answer
Q2. Oops concept dbms string data structures
Add your answer

Q1. General HR questions in easy level
Add your answer

It placed in hackerRank.question difficulty level was medium.

Q1. The difficulty depends upon who is taking your interview. But mostly asked questions were related to string and hashmap.
Add your answer

Q1. It was more like a little bit technical and hr round. Mostly talk about personal profile like education,family background, hobbies and etc.
Add your answer