Coding Interview Resources
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This channel contains the free resources and solution of coding problems which are usually asked in the interviews.

Managed by: @love_data
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Server Types
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πŸ”° TypeScript Roadmap for Beginners 2025
β”œβ”€β”€ 🧠 Why TypeScript? JavaScript with Superpowers
β”œβ”€β”€ βš™οΈ Setting up TypeScript (tsc, tsconfig)
β”œβ”€β”€ πŸ”‘ Type Annotations (number, string, boolean, etc.)
β”œβ”€β”€ πŸ“¦ Interfaces & Type Aliases
β”œβ”€β”€ 🧱 Classes, Inheritance & Access Modifiers
β”œβ”€β”€ πŸ” Generics
β”œβ”€β”€ ❌ Type Narrowing & Type Guards
β”œβ”€β”€ πŸ”„ Enums, Tuples & Union Types
β”œβ”€β”€ 🧩 Modules & Namespaces
β”œβ”€β”€ πŸ”§ Working with TypeScript & React/Vue
β”œβ”€β”€ πŸ§ͺ TypeScript Projects:
β”‚ β”œβ”€β”€ Form Validation App
β”‚ β”œβ”€β”€ API Data Viewer with TS + Fetch
β”‚ β”œβ”€β”€ Typed To-do App

Free Resources: https://whatsapp.com/channel/0029Vax4TBY9Bb62pAS3mX32
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Roadmap to learn Devops πŸ‘†
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Top 5 Websites Every Developer Should Bookmark πŸ”–πŸ’‘

1. DevDocs – All-in-one fast documentation ⚑

2. CanIUse – Check browser support like a pro 🌍

3. Roadmap .sh – Visual guides to grow your dev career πŸ—ΊοΈ

4. JSONLint – Instantly validate & format JSON 🧹

5. DataSimplifier – Free Data Analytics Resources 🎯

React ❀️ for more like this

#tech
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Top Programming Languages for Beginners πŸ‘†
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What's Flutter ? πŸ¦πŸ‘‡

1. Flutter is an open-source UI toolkit from Google for building natively compiled applications.

2. It enables cross-platform development for mobile, web, and desktop from a single codebase.

3. Uses Dart programming language, focusing on a fast and fluid user experience.

4. Features a rich set of pre-designed widgets and tools for rapid and easy UI creation.

5. Offers high performance close to native app speed, with a hot reload feature for quick development iterations.

#flutter
Important Sorting Algorithms-

Bubble Sort: Bubble Sort is the most basic sorting algorithm, and it works by repeatedly swapping adjacent elements if they are out of order.

Merge Sort: Merge sort is a sorting technique that uses the divide and conquer strategy.

Quicksort: Quicksort is a popular sorting algorithm that performs n log n comparisons on average when sorting an array of n elements. It is a more efficient and faster sorting algorithm.

Heap Sort: Heap sort works by visualizing the array elements as a special type of complete binary tree known as a heap.

Important Searching Algorithms-

Binary Search: Binary search employs the divide and conquer strategy, in which a sorted list is divided into two halves and the item is compared to the list’s middle element. If a match is found, the middle element’s location is returned.

Breadth-First Search(BFS): Breadth-first search is a graph traversal algorithm that begins at the root node and explores all neighboring nodes.

Depth-First Search(DFS): The depth-first search (DFS) algorithm begins with the first node of the graph and proceeds to go deeper and deeper until we find the goal node or node with no children.

#coding
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Programmers πŸ’ͺπŸ˜‚
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9 advanced coding project ideas to level up your skills:
πŸ›’ E-commerce Website β€” manage products, cart, payments
🧠 AI Chatbot β€” integrate NLP and machine learning
πŸ—ƒοΈ File Organizer β€” automate file sorting using scripts
πŸ“Š Data Dashboard β€” build interactive charts with real-time data
πŸ“š Blog Platform β€” full-stack project with user authentication
πŸ“ Location Tracker App β€” use maps and geolocation APIs
🏦 Budgeting App β€” analyze income/expenses and generate reports
πŸ“ Markdown Editor β€” real-time preview and formatting
πŸ” Job Tracker β€” store, filter, and search job applications

Coding Projects: https://whatsapp.com/channel/0029VazkxJ62UPB7OQhBE502

ENJOY LEARNING πŸ‘πŸ‘
Want to get started with System design interview preparation, start with these πŸ‘‡

1. Learn to understand requirements
2. Learn the difference between horizontal and vertical scaling.
3. Study latency and throughput trade-offs and optimization techniques.
4. Understand the CAP Theorem (Consistency, Availability, Partition Tolerance).
5. Learn HTTP/HTTPS protocols, request-response lifecycle, and headers.
6. Understand DNS and how domain resolution works.
7. Study load balancers, their types (Layer 4 and Layer 7), and algorithms.
8. Learn about CDNs, their use cases, and caching strategies.
9. Understand SQL databases (ACID properties, normalization) and NoSQL types (key–value, document, graph).
10. Study caching tools (Redis, Memcached) and strategies (write-through, write-back, eviction policies).
11. Learn about blob storage systems like S3 or Google Cloud Storage.
12. Study sharding and horizontal partitioning of databases.
13. Understand replication (leader–follower, multi-leader) and consistency models.
14. Learn failover mechanisms like active-passive and active-active setups.
15. Study message queues like RabbitMQ, Kafka, and SQS.
16. Understand consensus algorithms such as Paxos and Raft.
17. Learn event-driven architectures, Pub/Sub models, and event sourcing.
18. Study distributed transactions (two-phase commit, sagas).
19. Learn rate-limiting techniques (token bucket, leaky bucket algorithms).
20. Study API design principles for REST, GraphQL, and gRPC.
21. Understand microservices architecture, communication, and trade-offs with monoliths.
22. Learn authentication and authorization methods (OAuth, JWT, SSO).
23. Study metrics collection tools like Prometheus or Datadog.
24. Understand logging systems (e.g., ELK stack) and tracing tools (OpenTelemetry, Jaeger).
25.Learn about encryption (data at rest and in transit) and rate-limiting for security.
26. And then practise the most commonly asked questions like URL shorteners, chat systems, ride-sharing apps, search engines, video streaming, and e-commerce websites

Coding Interview Resources: https://whatsapp.com/channel/0029VammZijATRSlLxywEC3X
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Git Commands

πŸ›  git init – Initialize a new Git repository
πŸ“₯ git clone <repo> – Clone a repository
πŸ“Š git status – Check the status of your repository
βž• git add <file> – Add a file to the staging area
πŸ“ git commit -m "message" – Commit changes with a message
πŸš€ git push – Push changes to a remote repository
⬇️ git pull – Fetch and merge changes from a remote repository


Branching

πŸ“Œ git branch – List all branches
🌱 git branch <name> – Create a new branch
πŸ”„ git checkout <branch> – Switch to a branch
πŸ”— git merge <branch> – Merge a branch into the current branch
⚑️ git rebase <branch> – Apply commits on top of another branch


Undo & Fix Mistakes

βͺ git reset --soft HEAD~1 – Undo the last commit but keep changes
❌ git reset --hard HEAD~1 – Undo the last commit and discard changes
πŸ”„ git revert <commit> – Create a new commit that undoes a specific commit


Logs & History

πŸ“– git log – Show commit history
🌐 git log --oneline --graph --all – View commit history in a simple graph


Stashing

πŸ“₯ git stash – Save changes without committing
🎭 git stash pop – Apply stashed changes and remove them from stash


Remote & Collaboration

🌍 git remote -v – View remote repositories
πŸ“‘ git fetch – Fetch changes without merging
πŸ•΅οΈ git diff – Compare changes


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Your biggest enemy 𝐅𝐄𝐀𝐑 𝐨𝐟 π‘πžπ£πžπœπ­π’π¨π§

People hesitate to apply for many opportunities just because of fear of rejection.

However, not applying means you are automatically rejecting yourself. They usually think I will start applying after 6-8 months with full preparation.

Do you really think it will work ??? Interview calls usually take months πŸ˜…

My suggestion would be to start applying after 10 days to 1 month of preparation . Try to give as many interviews as you can. In this way, you will learn πŸ‘‡πŸ»

🌴 Frequently asked questions
🌴 Interview pattern
🌴 How to tweak your answers?

Give a try ,even in the worst scenario, you will get some interview experience. That experience will eventually help you in the future

All the best πŸ‘πŸ‘
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Top 7 Must-Prepare Topics for Coding Interviews (2025 Edition)

βœ… Arrays & Strings – Master problems on rotation, sliding window, two pointers, etc.
βœ… Linked Lists – Practice reversal, cycle detection, and merging lists
βœ… Hashing & Maps – Use hash tables for fast lookups and frequency-based problems
βœ… Recursion & Backtracking – Solve problems like permutations, subsets, and Sudoku
βœ… Dynamic Programming – Understand memoization, tabulation, and classic patterns
βœ… Trees & Graphs – Cover traversal (BFS/DFS), shortest paths, and tree operations
βœ… Stacks & Queues – Solve problems involving monotonic stacks, parentheses, and sliding windows

These are the essentials to crack FAANG-level interviews or product-based companies.

Coding Interview Resources: https://whatsapp.com/channel/0029VammZijATRSlLxywEC3X

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Here are some common frontend interview questions along with brief answers:

1. What is the DOM (Document Object Model)?
- Answer: The DOM is a programming interface for web documents. It represents the structure of a web page and allows scripts to dynamically access and update the content, structure, and style of a webpage.

2. Explain the difference between
null and undefined in JavaScript.
- Answer: null represents the intentional absence of any object value, while undefined represents a variable that has been declared but has not been assigned a value.

3. What are closures in JavaScript?
- Answer: Closures are functions that remember the scope in which they were created, even after that scope has exited. They have access to variables from their containing function's scope.

4. Describe the differences between CSS Grid and Flexbox.
- Answer: CSS Grid is a two-dimensional layout system, while Flexbox is one-dimensional. Grid is used for overall layout structure, while Flexbox is ideal for distributing space and aligning items within a container along a single axis.

5. What is responsive web design, and how do you achieve it?
- Answer: Responsive web design is an approach to design and coding that makes web pages render well on various devices and screen sizes. Achieve it through media queries, flexible grids, and fluid images.

6. Explain the "box model" in CSS.
- Answer: The box model describes how elements on a web page are rendered. It consists of content, padding, border, and margin, and these properties determine the element's total size.

7. How does the event delegation work in JavaScript?
- Answer: Event delegation is a technique where you attach a single event listener to a common ancestor of multiple elements instead of attaching listeners to each element individually. Events that bubble up from child elements can be handled by the ancestor.

8. What is the purpose of the
localStorage and sessionStorage objects in JavaScript?
- Answer: Both localStorage and sessionStorage allow you to store key-value pairs in a web browser. The key difference is that data stored in localStorage persists even after the browser is closed, whereas data in sessionStorage is cleared when the session ends (e.g., when the browser is closed).

9. Explain the same-origin policy in the context of web security.
- Answer: The same-origin policy is a security measure that restricts web pages from making requests to a different domain (protocol, port, or host) than the one that served the web page. It helps prevent cross-site request forgery (CSRF) and other security vulnerabilities.

10. What are the benefits of using a CSS preprocessor like Sass or Less?
- Answer: CSS preprocessors provide benefits such as variables, nesting, functions, and mixins, which enhance code reusability, maintainability, and organization. They allow you to write cleaner and more efficient CSS.

Web Development Best Resources: https://topmate.io/coding/930165

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πŸ”΄ How to MASTER a programming language using ChatGPT : πŸ“Œ

1. Can you provide some tips and best practices for writing clean and efficient code in [lang]?

2. What are some commonly asked interview questions about [lang]?

3. What are the advanced topics to learn in [lang]? Explain them to me with code examples.

4. Give me some practice questions along with solutions for [concept] in [lang].

5. What are some common mistakes that people make in [lang]?

6. Can you provide some tips and best practices for writing clean and efficient code in [lang]?

7. How can I optimize the performance of my code in [lang]?

8. What are some coding exercises or mini-projects I can do regularly to reinforce my understanding and application of [lang] concepts?

9. Are there any specific tools or frameworks that are commonly used in [lang]? How can I learn and utilize them effectively?

10. What are the debugging techniques and tools available in [lang] to help troubleshoot and fix code issues?

11. Are there any coding conventions or style guidelines that I should follow when writing code in [lang]?

12. How can I effectively collaborate with other developers in [lang] on a project?

13. What are some common data structures and algorithms that I should be familiar with in [lang]?

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Python Interview Questions – Part 1

1. What is Python?
Python is a high-level, interpreted programming language known for its readability and wide range of libraries.

2. Is Python statically typed or dynamically typed?
Dynamically typed. You don't need to declare data types explicitly.

3. What is the difference between a list and a tuple?

List is mutable, can be modified.

Tuple is immutable, cannot be changed after creation.


4. What is indentation in Python?
Indentation is used to define blocks of code. Python strictly relies on indentation instead of brackets {}.

5. What is the output of this code?

x = [1, 2, 3]
print(x * 2)

Answer: [1, 2, 3, 1, 2, 3]

6. Write a Python program to check if a number is even or odd.

num = int(input("Enter number: "))
if num % 2 == 0:
print("Even")
else:
print("Odd")

7. What is a Python dictionary?
A collection of key-value pairs. Example:

person = {"name": "Alice", "age": 25}

8. Write a function to return the square of a number.

def square(n):
return n * n


Coding Interviews: https://whatsapp.com/channel/0029VammZijATRSlLxywEC3X

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