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TCS Interview Questions and Answers
6.3k Interview questions
Abstract classes provide a base for subclasses with shared code, while interfaces define contracts for classes without implementation.
Abstract classes can have both abstract methods (without implementation) and concrete methods (with implementation).
Interfaces can only declare methods (no implementation) and can be implemented by any class, regardless of its position in the hierarchy.
A class can inherit from only ...
Java dependencies include libraries, frameworks, and runtime environments essential for Java applications to function correctly.
Java Runtime Environment (JRE): Required to run Java applications.
Java Development Kit (JDK): Necessary for developing Java applications.
External Libraries: Such as Apache Commons, Google Guava, which provide additional functionality.
Frameworks: Like Spring and Hibernate, which simplify d...
Experienced in SAP upgrades, ensuring smooth transitions and minimal downtime through careful planning and execution.
Conducted multiple SAP upgrades from ECC 6.0 to S/4HANA, enhancing system performance and user experience.
Utilized the Software Update Manager (SUM) tool for efficient upgrade processes, reducing downtime by 30%.
Performed thorough pre-upgrade checks, including system health checks and compatibility ...
IAM is a framework for managing digital identities and controlling access to resources within an organization.
IAM ensures that the right individuals have access to the right resources at the right times.
It involves user authentication (verifying identity) and authorization (granting access).
Examples include Single Sign-On (SSO) systems that allow users to log in once for multiple applications.
IAM solutions often i...
What people are saying about TCS
Effective strategies for handling critical situations include clear communication, prioritization, and maintaining composure under pressure.
Stay calm and composed to think clearly and make rational decisions.
Communicate effectively with all stakeholders to ensure everyone is informed.
Prioritize tasks based on urgency and impact, addressing the most critical issues first.
Document the situation and actions taken for...
Tableau offers various filters to refine data visualizations, including dimension, measure, context, and relative date filters.
Dimension Filters: Filter data based on categorical values, e.g., filtering sales data for specific regions.
Measure Filters: Filter data based on numerical values, e.g., showing only sales greater than $10,000.
Context Filters: Set the context for other filters, e.g., filtering data for a s...
TCS HR Interview Questions
Optimizing data in Tableau involves techniques to enhance performance and improve visualization efficiency.
Use extracts instead of live connections for faster performance. For example, extract data from a large database to speed up loading times.
Limit the data being pulled into Tableau by using filters. For instance, filter out unnecessary columns or rows in your data source.
Aggregate data at the source level to r...
Binary search is an efficient algorithm for finding an element in a sorted array by repeatedly dividing the search interval in half.
1. Binary search requires a sorted array to function correctly.
2. It works by comparing the target value to the middle element of the array.
3. If the target is equal to the middle element, the search is complete.
4. If the target is less than the middle element, search the left half.
5....
Sort an array of integers in ascending order using various algorithms like bubble sort, quicksort, or built-in functions.
Use built-in functions like sort() in Python: e.g., arr.sort() or sorted(arr).
Implement bubble sort: repeatedly swap adjacent elements if they are in the wrong order.
Quicksort: choose a pivot, partition the array, and recursively sort the subarrays.
Example: For input [3, 1, 4, 1, 5], the output ...
OOP features include encapsulation, inheritance, polymorphism, and abstraction, enhancing code reusability and organization.
Encapsulation: Bundling data and methods, e.g., a class representing a car with attributes like color and methods like drive().
Inheritance: Deriving new classes from existing ones, e.g., a 'Truck' class inheriting from a 'Vehicle' class.
Polymorphism: Allowing methods to do different things ba...
TCS Interview Experiences
11.2k interviews found
Interview Questionnaire
3 Questions
- Q1. 1. What is pharmacovigilance?
- Q2. What is the name of the authority in India ?
- Q3. Full form of medDra
Interview Preparation Tips
Selected
I appeared for an interview in Jan 2025.
(14 Questions)
- Q1. Queries on joins using inner join, left join, right join, outer join
- Q2. What are the definitions of case and decode, what are the differences between them, and can you explain the logic for each?
- Ans.
Case and decode are conditional expressions in PL/SQL used for data manipulation.
CASE is used for conditional logic in SQL statements, while DECODE is used for conditional logic in SELECT statements.
CASE is more flexible and can handle multiple conditions, while DECODE is limited to one condition.
CASE can be used in both SQL and PL/SQL, while DECODE is specific to SQL.
Example of CASE: SELECT CASE WHEN condition1 THEN r...
- Q3. What are the primary key and foreign key in database design, and can you provide examples of each?
- Ans.
Primary key uniquely identifies each record in a table, while foreign key establishes a link between two tables.
Primary key ensures uniqueness and cannot have null values
Foreign key establishes a relationship between tables based on the primary key of another table
Example of primary key: EmployeeID in an Employee table
Example of foreign key: DepartmentID in an Employee table linking to DepartmentID in a Department tabl...
- Q4. What are the differences between Rank and Dense Rank in SQL?
- Ans.
Rank assigns unique ranks to each distinct row, while Dense Rank assigns consecutive ranks without gaps.
Rank may have gaps in the ranking sequence, while Dense Rank does not.
Rank assigns the same rank to rows with the same values, while Dense Rank assigns different ranks.
Rank function is non-consecutive, while Dense Rank function is consecutive.
- Q5. What is the difference between procedures and functions?
- Ans.
Procedures are used to perform an action, while functions return a value.
Procedures do not return a value, while functions do.
Functions can be called from SQL queries, while procedures cannot.
Functions must return a value, while procedures do not necessarily have to.
- Q6. Is it possible to use a package body without a package specification?
- Ans.
No, a package body cannot be used without a package specification.
A package body must always be associated with a package specification.
The package specification defines the public interface of the package, while the package body contains the implementation details.
Attempting to use a package body without a corresponding package specification will result in compilation errors.
- Q7. What is a SQL query that can be used to find duplicate values in a database?
- Ans.
Use a SQL query with GROUP BY and HAVING clause to find duplicate values in a database.
Use GROUP BY clause to group the values that are duplicated.
Use HAVING clause to filter out the groups that have more than one occurrence.
Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;
- Q8. Queries using group by and having clause
- Q9. What are the definitions of the Substr and Instr functions?
- Ans.
Substr function extracts a substring from a string, while Instr function returns the position of a substring within a string.
Substr function syntax: SUBSTR(string, start_position, length)
Example: SUBSTR('Hello World', 7, 5) will return 'World'
Instr function syntax: INSTR(string, substring)
Example: INSTR('Hello World', 'World') will return 7
- Q10. What is the process for writing a SQL query that includes a subquery?
- Ans.
Writing a SQL query with a subquery involves nesting one query inside another to retrieve specific data.
Start by writing the main query that will retrieve the primary data
Identify the criteria for the subquery to filter the results
Enclose the subquery within parentheses and use it in the WHERE or FROM clause of the main query
Ensure that the subquery returns a single value or a single column result
- Q11. What is the difference between char, varchar, and varchar2 data types?
- Ans.
Char is fixed length, varchar is variable length with max 4000 bytes, varchar2 is variable length with max 32767 bytes.
Char is fixed length and always right-padded with spaces, while varchar and varchar2 are variable length.
Varchar can store up to 4000 bytes of data, while varchar2 can store up to 32767 bytes.
Char is less efficient in terms of storage compared to varchar and varchar2.
- Q12. Queries using Trunc and round
- Q13. Is it possible to combine two tables with differing data and columns without utilizing joins?
- Ans.
No, it is not possible to combine two tables with differing data and columns without utilizing joins.
Joins are necessary to combine tables based on a common column or key.
Different data and columns require a join to match and merge the data properly.
Examples of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
- Q14. Is it possible to update data in a view?
- Ans.
Yes, it is possible to update data in a view using INSTEAD OF triggers.
Views are virtual tables that display data from one or more tables.
By using INSTEAD OF triggers, you can update data in a view by specifying the logic to handle the update operation.
The trigger intercepts the update operation on the view and executes the specified logic to update the underlying tables.
For example, you can create an INSTEAD OF trigge...
(6 Questions)
- Q1. Can you describe yourself and provide details about your project, including the brief questions that were asked about it?
- Q2. Why TCS?
- Ans.
TCS is a global IT services company known for its innovative solutions and commitment to employee growth.
TCS has a strong reputation in the IT industry for delivering high-quality services.
TCS offers opportunities for professional growth and development through training programs and career advancement.
TCS has a diverse and inclusive work culture that values teamwork and collaboration.
- Q3. What is a dynamic cursor in database management?
- Ans.
A dynamic cursor in database management allows for the execution of different SQL queries at runtime.
Dynamic cursors are used when the SQL query to be executed is not known until runtime.
They allow for flexibility in querying the database based on user input or other conditions.
Dynamic cursors can be used to handle varying result sets or conditions in a more efficient manner.
Example: Using a dynamic cursor to search fo...
- Q4. Did you perform performance tuning, and if so, what steps did you take?
- Ans.
Yes, I have performed performance tuning by identifying bottlenecks and optimizing queries.
Identified slow queries using tools like SQL Trace, Explain Plan, and AWR reports.
Optimized queries by adding indexes, rewriting SQL statements, and reducing unnecessary data retrieval.
Tuned PL/SQL code by using bulk processing, minimizing context switches, and optimizing loops.
Utilized database features like partitioning and mat...
- Q5. What is the definition of a package, and is it possible to use a package body without a package specification?
- Ans.
A package in PL/SQL is a collection of related procedures, functions, variables, and other constructs.
A package consists of two parts: package specification and package body.
The package specification defines the public interface of the package, including declarations of variables, constants, cursors, procedures, and functions.
The package body contains the actual implementation of the procedures and functions declared i...
- Q6. I got more questions from my project related
(6 Questions)
- Q1. What are your reasons for wanting to join TCS?
- Ans.
I am excited about the opportunity to work with a global leader like TCS and contribute to innovative projects.
TCS is a renowned global company with a strong reputation in the IT industry
I am impressed by TCS's commitment to innovation and cutting-edge technology
I believe TCS offers great opportunities for professional growth and development
I am excited about the chance to work on diverse and challenging projects at TC...
- Q2. What is your current salary package?
- Ans.
I prefer to discuss my salary expectations based on the responsibilities and requirements of the position.
Focus on discussing salary expectations based on the job responsibilities and requirements.
Avoid disclosing specific current salary package.
Emphasize the importance of fair compensation based on market rates and skills.
Provide examples of successful projects or achievements that demonstrate your value.
Discuss oppor...
- Q3. What is your expected salary package?
- Ans.
I am looking for a competitive salary package based on my experience and skills.
I am open to discussing salary based on the responsibilities and requirements of the role.
I have researched the average salary range for Plsql Developers in this location.
I am looking for a package that includes benefits such as healthcare, retirement plans, and professional development opportunities.
- Q4. Are you comfortable with shift work?
- Ans.
Yes, I am comfortable with shift work and have experience working various shifts.
I have previous experience working different shifts in my current/previous roles.
I am flexible with my schedule and can easily adapt to changing shift patterns.
I understand the importance of shift work in ensuring 24/7 coverage for critical systems.
- Q5. Are you ok with any location
- Q6. Holding any other offers in hand
IT Security Compliance and Vulnerability Analyst Interview Questions & Answers
Anonymous
posted on 6 Mar 2025
I appeared for an interview in Feb 2025.
(3 Questions)
- Q1. Individuals with a strongIndividuals with a strong interest interest in in joining an Indian private multinational corporation, particularly Tata Consultancy joining an Indian private multinational corpora...
- Q2. Current job role and questions related to the same - DNS, SSL, HTTP
- Q3. Certification plans for coming year were asked
(1 Question)
- Q1. After much confusion between the coordinators, most of the interviewed participants were told to leave and wait for the next phase.
Interview Preparation Tips
I appeared for an interview in Apr 2025, where I was asked the following questions.
- Q1. TCS Bhubaneswar Absolutely the Worst Walk-in Interview Experience Ever! I’ve never seen such a poorly organized and mismanaged interview process in my life. The entire setup was a disaster from the start. ...
- Q2. The chaos, the waiting time, the heat, and the indifferent attitude of the panel made it one of the most frustrating and humiliating experiences ever. If you value your time, energy, and dignity — avoid th...
Interview Preparation Tips
Umesh Gond
Selected
I appeared for an interview in Feb 2025.
(2 Questions)
- Q1. Can you describe the end-to-end process you follow after receiving requirements from the Product Owner?
- Ans.
I follow a structured process to ensure requirements are effectively translated into actionable tasks for the team.
1. Requirement Analysis: Review and clarify requirements with the Product Owner to ensure understanding.
2. Backlog Refinement: Prioritize and break down requirements into user stories and tasks in the product backlog.
3. Sprint Planning: Collaborate with the team to estimate tasks and plan the sprint based ...
- Q2. How do you ensure that the quality of the Sprint demo is maintained?
- Ans.
Maintaining quality in Sprint demos involves preparation, stakeholder engagement, and continuous feedback.
Conduct thorough sprint reviews to ensure all features are demoed effectively.
Engage stakeholders early to gather feedback and adjust the demo accordingly.
Use real user scenarios during the demo to showcase functionality.
Prepare a clear agenda and objectives for the demo to keep it focused.
Incorporate feedback from...
(3 Questions)
- Q1. Tell me the typical day of a Scrum Master
- Ans.
A Scrum Master's day involves facilitating meetings, coaching teams, and removing obstacles to ensure smooth project delivery.
Start the day with a Daily Stand-up meeting to discuss progress and blockers.
Facilitate Sprint Planning sessions to define the scope of work for the upcoming sprint.
Conduct Sprint Reviews to showcase completed work and gather feedback from stakeholders.
Hold Retrospectives to reflect on the team'...
- Q2. What is the process you follow during your PI (Program Increment) planning?
- Ans.
During PI planning, I facilitate collaboration, align teams, and prioritize work for the upcoming increment.
Preparation: Gather input from stakeholders and teams to define objectives and features.
Team Breakouts: Facilitate sessions where teams estimate and plan their work for the increment.
Dependency Management: Identify and address dependencies between teams to ensure smooth execution.
Review and Adjust: Present plans ...
- Q3. Can you describe any recent issues or conflicts you have faced and how you resolved them?
- Ans.
Faced a conflict over resource allocation in a project, resolved through open communication and collaborative planning.
Identified the conflict during a sprint planning meeting when team members expressed concerns over resource availability.
Facilitated a discussion with stakeholders to understand their priorities and constraints.
Proposed a reallocation of tasks based on team members' strengths and current workloads, ens...
Selected
I appeared for an interview in Dec 2024.
(22 Questions)
- Q1. API Gateway implementation
- Ans.
API Gateway implementation is a centralized service that routes, manages, and secures API calls.
API Gateway acts as a single entry point for all API calls
It can handle authentication, rate limiting, caching, and request/response transformations
Examples include AWS API Gateway, Apigee, Kong
- Q2. Circuit breaker implementation
- Ans.
Circuit breaker is a design pattern used to prevent system overload by temporarily stopping requests to a failing service.
Circuit breaker monitors requests to a service and opens when the service fails repeatedly.
It helps prevent cascading failures and allows the system to gracefully degrade.
Once the circuit breaker is open, it can periodically check if the service has recovered before allowing requests again.
- Q3. What is deadlock? How to avoid it?
- Ans.
Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.
Avoid circular wait by ensuring processes request resources in the same order.
Prevent hold and wait by requiring processes to request all needed resources at once.
Implement a timeout mechanism to break potential deadlocks.
Use resource allocation graphs to detect and prevent deadlocks.
...
- Q4. Explain equals() method
- Q5. How mongodb was integrated in your application?
- Q6. What is hibernate?
- Q7. Runnable vs Callable interface
- Ans.
Runnable is a functional interface with a single run() method, while Callable is a functional interface with a single call() method.
Runnable is used for tasks that do not return a result, while Callable is used for tasks that return a result.
Callable can throw checked exceptions, while Runnable cannot.
Callable returns a Future object, which can be used to retrieve the result of the computation.
Example: Runnable - execu...
- Q8. Which type of data is returned by Callable interface?
- Q9. HashMap internal working
- Q10. Concurrent HashMap internal working
- Q11. How to monitor health of your application?
- Q12. How to call an API in a Microservice architecture?
- Q13. Explain Profiles
- Ans.
Profiles in Java are configurations that define the capabilities of a Java platform.
Profiles allow developers to target specific types of devices or applications.
They help in reducing the size of the Java runtime environment by including only the necessary APIs.
Examples include Java SE Embedded Profile for embedded devices and Java SE Compact Profile for resource-constrained environments.
- Q14. What is OpenFeign, and how is it used in microservices architecture?
- Ans.
OpenFeign is a declarative web service client used to simplify the process of making HTTP requests in microservices architecture.
OpenFeign allows developers to define RESTful web services as interfaces and automatically generate the necessary implementation code.
It integrates seamlessly with Spring Cloud and other microservices frameworks to facilitate communication between services.
OpenFeign supports features like loa...
- Q15. What is the implementation process for service registry and discovery?
- Ans.
Service registry and discovery involves registering services and allowing clients to discover and connect to them.
Implement a service registry where services can register themselves with metadata
Use a service discovery mechanism for clients to find and connect to services
Implement health checks to ensure services are available and healthy
Use a load balancer to distribute traffic among multiple instances of a service
- Q16. What are Spring boot actuators?
- Ans.
Spring Boot Actuators are built-in tools that provide insight into the running application.
Actuators expose various endpoints to monitor and manage the application.
They can be used to check health, metrics, environment details, and more.
Examples include /actuator/health, /actuator/metrics, and /actuator/env.
- Q17. Synchronous vs Asynchronous communication
- Ans.
Synchronous communication is blocking, while asynchronous communication is non-blocking.
Synchronous communication waits for a response before continuing, while asynchronous communication does not wait.
Examples of synchronous communication include traditional function calls, while examples of asynchronous communication include callbacks and promises.
Synchronous communication can lead to performance issues if there are d...
- Q18. Explain Synchronized keyword
- Q19. What are the consequences of excessively using synchronized blocks and methods in Java?
- Ans.
Excessive use of synchronized blocks and methods in Java can lead to performance issues and potential deadlocks.
Decreased performance due to increased contention for locks
Potential deadlocks if multiple threads are waiting for each other to release locks
Increased complexity and difficulty in debugging and maintaining code
Use synchronized sparingly and consider alternatives like ConcurrentHashMap or Lock interface
- Q20. How can you determine the number of threads needed for your application?
- Ans.
The number of threads needed for an application can be determined based on factors like the type of tasks, hardware resources, and performance requirements.
Consider the type of tasks your application needs to perform - CPU-bound tasks may benefit from more threads, while I/O-bound tasks may not.
Take into account the hardware resources available - more threads may be beneficial on a multi-core processor compared to a si...
- Q21. Explain Executor framework
- Q22. Explain BlockingQueue
(2 Questions)
- Q1. Why did you leave your previous company?
- Q2. Other basic questions asked regarding the relevant skills and technologies I have worked with.
Skills evaluated in this interview
Selected
I appeared for an interview in Feb 2025.
(3 Questions)
- Q1. Why Angular is used and What is SPA.
- Ans.
Angular is a powerful framework for building dynamic single-page applications (SPAs) using TypeScript.
Angular provides a structured approach to building web applications, making it easier to manage complex UIs.
It uses components to encapsulate functionality, promoting reusability and maintainability.
Angular's two-way data binding ensures that changes in the UI reflect in the model and vice versa, enhancing user experie...
- Q2. RxJs Operators like mergeMap, switchMap, concatMap and NgRx related questions.
- Q3. Basic with little advanced questions related to angular.
(1 Question)
- Q1. What is day to day activities, what process you're following.
- Ans.
As a Senior Software Engineer, my day involves coding, collaboration, and continuous learning to deliver high-quality software.
Daily stand-up meetings to discuss progress and blockers.
Code reviews to ensure quality and share knowledge with the team.
Collaborating with product managers to refine requirements and prioritize tasks.
Writing and maintaining unit tests to ensure code reliability.
Participating in sprint plannin...
Interview Preparation Tips
Aishwarya Pimple
Selected
I could relate to my knowledge.
(3 Questions)
- Q1. What are the Object-Oriented Programming (OOP) concepts in Java?
- Ans.
OOP concepts in Java include classes, objects, inheritance, polymorphism, encapsulation, and abstraction.
Classes: Blueprint for creating objects.
Objects: Instances of classes that encapsulate data and behavior.
Inheritance: Allows a class to inherit properties and methods from another class.
Polymorphism: Ability to present the same interface for different data types.
Encapsulation: Bundling data and methods that operate ...
- Q2. Can you explain what you have learned in Java?
- Ans.
I have learned Java programming language extensively, including object-oriented programming concepts, data structures, and algorithms.
Extensive knowledge of Java syntax and features
Understanding of object-oriented programming concepts like inheritance, polymorphism, and encapsulation
Experience with data structures such as arrays, linked lists, stacks, and queues
Knowledge of algorithms like sorting, searching, and graph...
- Q3. Can you explain what all knowledge do you have in java
- Ans.
I have extensive knowledge in Java programming language, including core concepts, data structures, multithreading, and design patterns.
Strong understanding of core Java concepts such as OOP, inheritance, polymorphism, and encapsulation
Experience with data structures and algorithms in Java, including arrays, linked lists, trees, and graphs
Proficient in multithreading and concurrency in Java, including synchronization an...
(2 Questions)
- Q1. Are you willing to relocate?
- Q2. How would you handle a situation in which you receive no support from your team on a project?
- Ans.
I would address the issue by communicating with my team, seeking feedback, and finding alternative solutions.
Initiate a meeting with the team to discuss the lack of support and understand their perspectives
Seek feedback on how to improve collaboration and address any concerns
Explore alternative solutions or resources to move the project forward
Maintain open communication and transparency throughout the process
Interview Preparation Tips
Selected
I appeared for an interview in Jun 2025, where I was asked the following questions.
- Q1. Why are you choosing this company
- Ans.
I am drawn to Helper for its commitment to innovation, community impact, and a collaborative work culture that fosters personal growth.
Helper's innovative approach to problem-solving aligns with my passion for creativity and technology.
The company's strong emphasis on community service resonates with my values, as I believe in giving back.
I admire Helper's collaborative work environment, which encourages teamwork and k...
- Q2. What salary do you expect
- Ans.
I expect a salary that reflects my skills, experience, and the industry standards for this role.
Research industry standards: For example, similar roles in my area typically offer between $X and $Y.
Consider my experience: With over Z years in the field, I bring valuable expertise that justifies a higher salary.
Factor in job responsibilities: This role requires specific skills that are in high demand, which can influence...
- Q3. Why are you hired for this job
- Ans.
I bring a unique blend of skills, experience, and passion that aligns perfectly with the needs of this role.
Proven track record in similar roles, such as increasing team efficiency by 20% in my last position.
Strong communication skills, demonstrated by successfully leading cross-functional teams on multiple projects.
Adaptability to new challenges, evidenced by my quick learning of new software that improved project del...
- Q4. What is you qualification
- Ans.
I hold a degree in Computer Science and have extensive experience in software development and project management.
Bachelor's degree in Computer Science from XYZ University.
5 years of experience in software development, specializing in web applications.
Proficient in programming languages such as Java, Python, and JavaScript.
Led a team of developers in a successful project that increased client satisfaction by 30%.
Certifi...
- Q5. Why you choose this option after 12th
- Ans.
I chose this option after 12th because it aligns with my interests, career goals, and the skills I want to develop.
Passion for the subject: I have always been fascinated by science and technology, which led me to pursue engineering.
Career opportunities: The field offers diverse job prospects, such as software development and data analysis.
Skill development: I wanted to enhance my problem-solving and analytical skills, ...
- Q6. Why do you need this job
- Ans.
I need this job to grow professionally, contribute to a team, and make a positive impact in the community.
I am eager to develop my skills in a challenging environment, such as working on innovative projects.
This position aligns with my career goals, allowing me to gain experience in a field I am passionate about.
I want to collaborate with a team of professionals who share my values and commitment to excellence.
I believ...
Naveen sankar
Selected
I appeared for an interview in Jun 2025, where I was asked the following questions.
- Q1. Questions are mostly related to the .NET the stack
- Q2. Also, azure related questions were asked
- Q3. SQL server T-sql related questions
- Q4. ASP.NET related questions
Selected
(5 Questions)
- Q1. React Life cycle
- Q2. What React hooks have you utilized in your projects?
- Ans.
I have utilized useState, useEffect, useContext, and useRef hooks in my projects.
useState - for managing state in functional components
useEffect - for handling side effects in functional components
useContext - for accessing context in functional components
useRef - for accessing DOM elements or storing mutable values
- Q3. What is Redux, and what are the differences between Redux and Context?
- Ans.
Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.
Redux is a state management library commonly used with React to manage the state of an application.
It follows a unidirectional data flow pattern, where the state is stored in a single store and changes are made through actions and reducers.
Redux allows for a more structured way of managing state ...
- Q4. What is the difference between visibility: hidden and display: none in CSS?
- Ans.
visibility: hidden hides an element but still takes up space, while display: none hides an element and removes it from the flow of the document.
visibility: hidden hides the element but it still occupies space on the page
display: none hides the element and removes it from the document flow
visibility: hidden elements are still rendered, just not visible
display: none elements are not rendered at all
- Q5. What are JavaScript closures, the temporal dead zone (TDZ), hoisting, and the JavaScript engine?
- Ans.
JavaScript closures, TDZ, hoisting, and the JavaScript engine are key concepts in understanding how JavaScript works.
JavaScript closures are functions that have access to variables from their outer scope even after the outer function has finished executing.
Temporal Dead Zone (TDZ) is the period between entering a scope and the variable being declared where accessing the variable results in a ReferenceError.
Hoisting is ...
Identify the duplicate character in the string.
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