Coder Baba

📚 Company-Specific DSA Material: LeetCode Questions 📚

Don't overwhelm to learn Git,🙌 Git is only this much👇😇 1.Core: • git init • git clone • git add • git commit • git status • git diff • git checkout • git reset • git log • git show • git tag • git push • git pull 2.Branching: • git branch • git checkout -b • git merge • git rebase • git branch --set-upstream-to • git branch --unset-upstream • git cherry-pick 3.Merging: • git merge • git rebase 4.Stashing: • git stash • git stash pop • git stash list • git stash apply • git stash drop 5.Remotes: • git remote • git remote add • git remote remove • git fetch • git pull • git push • git clone --mirror 6.Configuration: • git config • git global config • git reset config 7. Plumbing: • git cat-file • git checkout-index • git commit-tree • git diff-tree • git for-each-ref • git hash-object • git ls-files • git ls-remote • git merge-tree • git read-tree • git rev-parse • git show-branch • git show-ref • git symbolic-ref • git tag --list • git update-ref 8.Porcelain: • git blame • git bisect • git checkout • git commit • git diff • git fetch • git grep • git log • git merge • git push • git rebase • git reset • git show • git tag 9.Alias: • git config --global alias.<alias> <command> 10.Hook: • git config --local core.hooksPath <path> ✅ Add more peoples to this groups 🙌 #coderbaba #git follow @coder_baba

Top 50 Linux Commands You Must Know as a Regular User... 1. ls - view contents of directory (list) 2. pwd - path of the current directory 3. cd - change directoryn 4. mkdir - make new directory 5. mv - move files / rename files 6. cp - copy files 7. rm - remove files 8. touch - create blank new file 9. rmdir - delete directory 10. cat - list content of file to terminal 11. clear - clear terminal window 12. echo - move data into a file 13. less - Read text file one screen at a time 14. man - show manual of Linux commands 15. sudo - enables you to perform tasks that require administrative or root permissions 16. top - task manager in terminal 17. tar - used to archive multiple files into a tarball 18. grep - used to searching words in specific files 19. head - view first lines of any text file 20. tail - view last lines of any text file 21. diff - compares the contents of two files line by line 22. kill - used for killing unresponsive program 23. jobs - display all current jobs along with their statuses 24. sort - is a command line utility for sorting lines of text files 25. df - info about system disk 26. du - check how much space a file or directory takes 27. zip - to compress your files into a zip archive 28. unzip - to extract the zipped files from a zip archive 29. ssh - a secure encrypted connection between two hosts over and insecure network 30. cal - shows calendar 31. apt - command line tool for interaction with packaging system 32. alias - custom shortcuts used to represent a command 33. w - current user info 34. whereis - used to locate the binary, source, manual page files 35. whatis - used to get one-line man page description 36. useradd - used to create a new user 37. passwd - used to changing password of current user 38. whoami - print current user 39. uptime - print current time when machine starts 40. free - print free disk space info 41. history - print used commands history 42. uname - print detailed information about your Linux system 43. ping - to check connectivity status to a server 44. chmod - to change permissions of files and directories 45. chown - to change ownership of files and directories 46. find - using find searches for files and directories 47. locate - used to locate a file, just like the search command in Windows 48. ifconfig - print ip address stuff 49. ip a - similar to ifconfig but shortest print 50. finger - gives you a short dump of info about a user Follow @coder_baba #coderbaba #linux #cmd

100+ Practice Questions ❍ C/C++ ❍ Python ❍ JavaScript ❍ Java ❍ C# ❍ Golang ➊ Simple Numbers ➀ Find a digit at a specific place in a number ➁ Find count of digits in a number ➂ Find the largest digit ➃ Find the 2nd largest digit ➄ Find the kth largest digit ➅ Find the smallest digit ➆ Find the 2nd smallest digit ➇ Find the kth smallest digit ➈ Find generic root (sum of all digits) of a number ➉ Reverse the digits in a number ➀➀ Rotate the digits in a number ➀➁ Is the number a palindrome? ➀➂ Find sum of 'n' numbers ➀➃ Check if a number is perfect square ➀➄ Find a number in an AP sequence ➀➅ Find a number in a GP sequence ➀➆ Find a number in fibonacci sequence ➀➇ Check number divisibility by 2, 3, 5, 9 ➀➈ Check if a number is primary or not 20. Given a number, print all primes smaller than it ➁➀ Check if a number is circular prime or not ➁➁ Find all prime factors of a number ➁➂ Find the GCD of 2 numbers ➁➃ Find the LCM of 2 numbers ➁➄ Find the factorial of a number ➁➅ Find the exponentiation of a number ➋ Unit Conversion ➀ Number Base (Binary, Octal, Hexadecimal, Decimal) ➁ Weight (gram, kg, pound) ➂ Height (cm, m, inch, feet) ➃ Temperature (centigrade, fahrenhite) ➄ Distance (km, mile) ➅ Area (m², km², acre) ➆ Volume (ltr, gallon) ➇ Time (sec, min, hour) ➈ Currency ➌ Calculator ➀ Loan EMI Calculator ➁ Fixed Deposit Returns Calculator ➂ Interest Calculator ➃ BMI Calculator ➄ Item Price (considering tax, discount, shipping) ➅ Tip Calculator ➍ Geometry ➀ Find distance between 2 points ➁ Given 2 sides of a right angle triangle, find the 3rd ➂ Find 3rd angle of a triangle when 2 are given ➃ Area of a triangle when 3 sides are given ➄ Area of a right angle triangle ➅ Perimeter of a Square ➆ Area of a Square ➇ Perimeter of a Rectangle ➈ Area of a Rectangle ➉ Circumference of a Circle ➀➀ Area of a Circle ➀➁ Circumference of a Semi-Circle ➀➂ Area of a Semi-Circle ➀➃ Area of a Ring ➀➄ Circumference of an Ellipse ➀➅ Area of an Ellipse ➀➆ Suface Area of a Sphere ➀➇ Volume of a Sphere ➀➈ Surface Area of a Hemisphere 20. Volume of a Hemisphere ➁➀ Surface area of a Cube ➁➁ Volume of a Cube ➁➂ Surface area of a Cylinder ➁➃ Volume of a Cylinder ➎ Vector ➀ Find Scalar Multiplication of a vector ➁ Find addition/subtraction of vectors ➂ Find magnitude of a vector ➃ Find an unit vector along a given vector ➄ Find dot product of 2 vectors ➅ Find cross product of 2 vectors ➆ Check if 2 vectors are orthogonal ➏ Matrix ➀ Find the determinant of a matrix ➁ Find Scalar Multiplication of a matrix ➂ Find addition/subtraction of matrices ➃ Find the transpose of a matrix ➄ Find if 2 matrices are orthogonal ➅ Find inverse of a 2x2 and 3x3 matrix ➐ Set ➀ Find Union of 2 sets ➁ Find Intersection of 2 sets ➂ Find the Difference of 2 sets ➃ Find the Symmetric Difference of 2 sets ➄ Find if a set is subset/superset of another set ➅ Find if 2 sets are disjoints ➑ Special Numbers ➀ Strong Number ➁ Perfect Number ➂ Armstrong Number ➃ Harshad Number ➄ Kaprekar Number ➅ Lychrel Number ➆ Narcissistic Decimal Number ➇ Lucus Number ➈ Catalan Number ➉ Duck Number ➀➀ Ugly Number ➀➁ Abundant Number ➀➂ Deficient Number ➀➃ Automorphic Number ➀➄ Magic Number ➀➅ Friendly Pair Numbers ➀➆ Neon Number ➀➇ Spy Number ➀➈ Happy Number 20. Sunny Number ➁➀ Disarium Number ➁➁ Pronic Number ➁➂ Trimorphic Number ➁➃ Evil Number ➁➄ Amicable Pairs ⬘ If you want to excel in programming, practice a lot. ⬙ Problems based on numbers are easy to start with and they help in improving your analytical skills. follow @coder_baba

DB Interview questions Position - Associate Developer Package - 26LPA 1st Round 🔥 1. What are the new features introduced in Java 8. https://www.baeldung.com/java-8-new-features 2. Sort a student class list based on the student age in descending order. https://www.educative.io/answers/how-to-sort-a-list-of-user-defined-objects-in-java 3. Write a logic to detect a loop in linked list and remove the loop https://www.google.com/amp/s/www.geeksforgeeks.org/detect-loop-in-a-linked-list/amp/ 4. Design HashMap put method. https://www.turing.com/kb/implementing-hashmap-in-java 5. How to divide a monolithic application to Microservice https://martinfowler.com/articles/break-monolith-into-microservices.html 6. Why String is immutable https://www.google.com/amp/s/www.geeksforgeeks.org/java-string-is-immutable-what-exactly-is-the-meaning/amp/ 7. How Redis Works and what are the different caching strategies. https://codedamn.com/news/backend/advanced-redis-caching-techniques 8. How to add a list in redis cache and how to access the data again https://redis.io/glossary/lists-in-redis/ 9. What are the design pattern spring boots internally use https://www.baeldung.com/spring-framework-design-patterns 10. How spring Auto configuration features works https://www.marcobehler.com/guides/spring-boot-autoconfiguration 11. How to enable hibernate caching https://www.baeldung.com/hibernate-second-level-cache 12. Lazy loading vs Eager Loading https://www.imperva.com/learn/performance/lazy-loading/ 13. Asked me to improve one SQL query https://developernation.net/blog/12-ways-to-optimize-sql-queries-in-database-management/ 2nd Round 🔥 1. Implements a search engine, something like Google. Low Level Coding https://medium.com/@maxi.gkd/building-a-search-engine-using-a-trie-data-structure-cb79475d8a3d 2. How Pulisher Subscribe modal works https://www.geeksforgeeks.org/what-is-pub-sub/ 3. How to restrict an API call to be called from users who have required roles and permission https://www.baeldung.com/role-and-privilege-for-spring-security-registration 4. Request Scope in spring boot https://www.baeldung.com/spring-bean-scopes#:~:text=The%20request%20scope%20creates%20a,for%20a%20particular%20WebSocket%20session. 5. How to exclude a dependency https://www.baeldung.com/mvn-plugin-dependency-exclusion 6. How to pass JWT token in rest api call https://www.toptal.com/spring/spring-security-tutorial 7. logic to execute a method after every one hour without using Cron job https://stackoverflow.com/questions/10748212/how-to-call-function-every-hour-also-how-can-i-loop-this#:~:text=Create%20a%20Timer%20object%20and,timer. while(1==1) { //Your code here try{ Thread.sleep(3600000); } catch (Exception e) {} } 8. Difference between scheduled and cached thread pool https://www.linkedin.com/pulse/types-thread-pool-executors-aniket-nandan?utm_source=share&utm_medium=member_android&utm_campaign=share_via ___ ❤️ Please add more peoples to this telegram channel . follow @coder_baba

DSA Notes https://www.instagram.com/reel/C5yS_fNy82l/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

Database keys : Database keys are essential for organizing and managing data effectively. In this post, we'll explore ten key concepts that every IT professional should know. 1. 🗝 𝗣𝗿𝗶𝗺𝗮𝗿𝘆 𝗞𝗲𝘆 - A unique identifier for each record in a table. - Cannot be null. - Ensures that each row is unique. 2. 🌉 𝗙𝗼𝗿𝗲𝗶𝗴𝗻 𝗞𝗲𝘆 - A field in one table that refers to the Primary Key of another table. - Establishes relationships between tables. 3. 🧩 𝗖𝗼𝗺𝗽𝗼𝘀𝗶𝘁𝗲 𝗞𝗲𝘆 - A combination of two or more columns that uniquely identifies each record. - Useful when a single column can't uniquely identify a record. 4. 💪 𝗦𝘂𝗽𝗲𝗿 𝗞𝗲𝘆 - One or more columns that can uniquely identify a record. - A Primary Key is a type of Super Key. 5. 🏅 𝗖𝗮𝗻𝗱𝗶𝗱𝗮𝘁𝗲 𝗞𝗲𝘆 - A column or set of columns that could be the Primary Key. - Must be unique. 6. 🔍 𝗨𝗻𝗶𝗾𝘂𝗲 𝗞𝗲𝘆 - Ensures uniqueness for a column or column combination. - Similar to Primary Key but allows one null value. 7. 🛤 𝗔𝗹𝘁𝗲𝗿𝗻𝗮𝘁𝗲 𝗞𝗲𝘆 - A Candidate Key that isn't the Primary Key. - Another option for a unique identifier. 8. 🍃 𝗡𝗮𝘁𝘂𝗿𝗮𝗹 𝗞𝗲𝘆 - A key that's a natural part of the data, like an email address. 9. 🎭 𝗦𝘂𝗿𝗿𝗼𝗴𝗮𝘁𝗲 𝗞𝗲𝘆 - An artificial key created when no natural unique identifier exists. 10. 🔑 𝗦𝗲𝗰𝗼𝗻𝗱𝗮𝗿𝘆 𝗞𝗲𝘆 - Used for data retrieval, not identification. - Helps create non-clustered indexes.

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50 PROJECTS IN 50 DAYS - HTML, CSS & JAVASCRIPT 🔥 https://drive.google.com/drive/folders/1GxODsAg9lK9L1YIhvHahx3QYGi2wc1t8