RNF Technologies 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
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Q2. Sharding in Node js
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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
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Q3. Indexing in Node js
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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.
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Q1. How abstraction and inheritance are related?
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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
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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
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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.
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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
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Q1. I don't know why they rejected me
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Q2. What ever they asked me for coding part the output is correct and logic is also correct
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Q1. Java related question
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Q2. Web services related question
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Q1. Project related question
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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
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Q2. Oops concept dbms string data structures
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Q1. General HR questions in easy level
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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.
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Q1. It was more like a little bit technical and hr round. Mostly talk about personal profile like education,family background, hobbies and etc.
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Basic coding excercise , linux platform.file handling

Q1. Simpe question , family baground,
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Q2. Strength , weakness,
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