Data Economy Software Intern Interview Questions and Answers

Q1. About the project that I have worked
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Q2. Technical Experience
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Q1. Databinding in android
Ans. 
Databinding in Android allows for easier connection between UI components and data sources.
• Databinding eliminates the need for findViewById() calls in your code.

• It allows for easier access to data in your layouts using data binding expressions.

• Databinding can improve code readability and reduce boilerplate code.

• Example:
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Q2. What is the packaging process in android
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Packaging process in Android involves compiling the code, resources, and assets into an APK file for distribution.
• Compile the Java code into .class files

• Compile the resources (XML files, images, etc.) into a binary format

• Package all the compiled files into an APK file using the Android Asset Packaging Tool (AAPT)

• Sign the APK file with a private key for security

• Align the APK file for optimization
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Q3. What is an MVVM design pattern
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MVVM is a design pattern that separates the user interface from the business logic and data model.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View represents the user interface

• ViewModel acts as an intermediary between the Model and View

• MVVM helps in achieving separation of concerns and easier unit testing
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Q1. Most of the question related to architecture and system design
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Q1. Face to face interview with director
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Aptitude questions with some basic coding questions

They have given 3 coding questions and some pseudo codings

Q1. Tell about your self
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Q2. Some coding questions
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The problem statement was given to solve.

Q1. Explain liskov substitution principle with examples?
Ans. 
Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.
• Subtypes must be substitutable for their base types.

• Derived classes should be able to extend the functionality of base classes without changing their behavior.

• Violating this principle can lead to unexpected behavior in the program.

• Example: If a Square class i...read more
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Q2. Importance of abstraction
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Abstraction is crucial in software development to simplify complexity, improve readability, and promote reusability.
• Abstraction helps in hiding unnecessary details and focusing on essential features.

• It allows developers to work at a higher level of understanding without getting bogged down in implementation details.

• Abstraction promotes code reusability by creating modular and reusable components.

• It improves code readab...read more
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Q3. Importance of Unit testing in clean close
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Unit testing is crucial in ensuring clean code by verifying the functionality of individual units of code.
• Unit testing helps in identifying bugs and errors early in the development process.

• It ensures that each unit of code works as expected in isolation.

• Unit tests act as documentation for the codebase, making it easier for new developers to understand and modify the code.

• It promotes code reusability and maintainability...read more
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Dsa problems dp and tress problem

Q1. Tell me about your self
Ans. 
I am a passionate software engineer with 5 years of experience in developing web applications using various technologies.
• 5 years of experience in software development

• Proficient in developing web applications

• Skilled in using various technologies

• Passionate about software engineering
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Q2. Projects and intership
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Q1. Types of filters
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Types of filters include low-pass, high-pass, band-pass, and band-stop filters.
• Low-pass filter allows frequencies below a certain cutoff frequency to pass through.

• High-pass filter allows frequencies above a certain cutoff frequency to pass through.

• Band-pass filter allows a specific range of frequencies to pass through.

• Band-stop filter blocks a specific range of frequencies from passing through.
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Q1. Project Details
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1. Coin change
2. Valid Parenthesis
3. Bipartite graph question

Q1. Resume based. Find duplicate. Valid Parenthesis. Generate Random id Find max no of random id can be generated
Ans. 
The question involves finding duplicates in an array, validating parentheses, generating random IDs, and determining the maximum number of random IDs that can be generated.
• To find duplicates in an array, you can use a hash set to store unique elements and check for duplicates as you iterate through the array.

• To validate parentheses, you can use a stack data structure to keep track of opening and closing parentheses.

• To ...read more
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Q1. Core questions. LRU cache. Validate invalid BST
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Q1. DP problem which I was unable to solve so rejected.
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Q1. Asked about technologies and coding
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Q2. Components in reactjs
Ans. 
Reactjs components are reusable, independent pieces of UI that can be composed together to build complex user interfaces.
• Components are the building blocks of a React application

• They can be class components or functional components

• Components can have their own state and lifecycle methods

• Components can be nested within other components to create a hierarchy

• Examples: Button component, Navbar component, UserList component
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Q3. Given url to fetch data from api
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Use the url to make a request to the API and fetch data.
• Use a library like axios or fetch to make the HTTP request.

• Parse the response data to extract the necessary information.

• Handle any errors that may occur during the request.
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Q4. Cloud related scenerio questions
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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