Virtual Galaxy Infotech Plsql Developer Interview Questions and Answers

Q1. Tell me about your self
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Q1. Let var const difference
Ans. 
var, let, and const are all used to declare variables in JavaScript, but they have different scopes and mutability.
• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared
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Q2. Polyfills of bind method
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Polyfills of bind method provide a way to use the bind method in older browsers that do not support it natively.
• Polyfill code typically checks if the bind method is available and if not, it creates a new function that mimics the behavior of bind.

• One common polyfill for the bind method is the following: Function.prototype.bind = Function.prototype.bind || function() { // polyfill code here };

• Polyfills are often used to ...read more
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Q1. Make a search bar in React
Ans. 
Create a search bar component in React for filtering data
• Create a functional component for the search bar

• Use state to store the search query

• Implement a onChange event handler to update the search query

• Filter the data based on the search query
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Q2. React js core concepts
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Q1. How you structure your work
Ans. 
I structure my work by breaking down tasks, setting priorities, creating timelines, and regularly reviewing progress.
• Break down tasks into smaller, manageable chunks

• Set priorities based on deadlines and importance

• Create timelines to track progress and ensure timely completion

• Regularly review progress and adjust plans as needed
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Q2. How you make a project from scratch
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To make a project from scratch, start by defining requirements, creating a plan, designing the architecture, implementing the code, testing, and deploying.
• Define project requirements and goals

• Create a project plan with timelines and milestones

• Design the architecture of the project, including database schema and system components

• Implement the code following best practices and coding standards

• Test the project thoroughly ...read more
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Basic maths question

It was a live coding round where expectation was to come up with a framework in Java from Scratch

Q1. It was a DS/Algo Round
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Q1. Design Round in HLD
Ans. 
Design Round in HLD involves creating a high-level design for a software system.
• Identify the main components of the system and their interactions

• Define the architecture of the system including layers, modules, and interfaces

• Consider scalability, performance, security, and maintainability

• Use UML diagrams like class diagrams, sequence diagrams, and component diagrams

• Document the design decisions and rationale
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Q1. Can you tell me about yourself?
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Q2. Why should we hire you?
Ans. 
I have a strong technical background, a passion for problem-solving, and a proven track record of delivering high-quality software solutions.
• Extensive experience in software development, including proficiency in multiple programming languages such as Java, Python, and JavaScript.

• Strong problem-solving skills and ability to think critically to find innovative solutions to complex technical challenges.

• Proven track record...read more
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Q1. Implement readers-writer lock
Ans. 
A readers-writer lock allows concurrent access for readers and exclusive access for writers, ensuring data consistency.
• Readers can access the resource simultaneously, improving performance.

• Writers require exclusive access, blocking readers during write operations.

• Use a counter to track active readers and a mutex for writers.

• Example: In a database, multiple queries can read data while updates are restricted.
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Q1. Java, spring boot and Micro service related questions
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There were 50 question out of which if you score 20 you were passed out to next round, No negative markings.