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I added 15 LeetCode style problems for Machine Learning to NeetCode IO 🚀

You can solve problems ranging from Gradient Descent, to learning PyTorch basics, and ultimately code a simplified GPT chat bot.

All within your browser. No ML or Math background necessary.

🎥 There are video explanations to give you the background needed for each problem as well as the solutions.


Btw, it’s completely free so try it out:  https://neetcode.io/practice?subpage=practice&tab=coreSkills&topic=Machine%20Learning&utm_source=linkedin 


This was added in collaboration with  @GPTandChill   who created the problems and solutions. Big thank you to him. 

Over 6% of LeetCode's traffic now comes from me. That's nuts!! 🥜


If you're studying for coding interviews & you're not using  https://neetcode.io/  you may want to reconsider :)

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It seems the next logical step for me would be to remove the dependency on leetcode. Or at least allow you to solve problems without navigating away (for free ofc). What do you guys think? 

Just hit 600K subs... and embarrassingly only uploaded 11 times this year. 


Thank you so much for joining me for the ride! Next stop 1 million 🚀 (i just want the gold YT play button)

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FYI I did upload ~200 videos on the second channel this year:   @NeetCodeIO 

I recently coded a simplified Youtube clone for my full stack development course - here’s how:





🪣 Cloud Storage - An object storage solution used to upload and serve videos to users.



🏃 Cloud Pub/Sub - An auto-scaling message queue used to queue raw videos before they can be transcoded.


🎥 Cloud Run (video transcoding workers) - A managed service for Docker containers. Used to run a set of workers which transcode raw videos into different resolutions via FFmpeg (popular open source transcoding tool).


💎 Cloud Run (nextjs client) - I built the UI with NextJS and served it from Cloud Run for simplicity and auto-scaling.


🔥 Firestore - A document-based database used to store app data including user info, video metadata, etc.


💻 Firebase Functions - Serverless functions (AWS lambda equivalents) used to build a REST API for the client to fetch urls of processed videos.




There's a reason most online tutorials only show you how to clone an app's frontend. Even though I relied heavily on managed cloud services, this project is FAR from production ready.





𝐀 𝐟𝐞𝐰 𝐥𝐢𝐦𝐢𝐭𝐚𝐭𝐢𝐨𝐧𝐬:
- Videos that take > 600 seconds to process will cause issues (because I used simple Push-based subscriptions rather than Pull-based)
- GCS provides very barebones video streaming capabilities. YouTube actually uses DASH (Dynamic Adaptive Streaming over HTTP) to stream videos, meanwhile Netflix uses HLS (HTTP Live Streaming)





𝐌𝐨𝐫𝐚𝐥 𝐨𝐟 𝐭𝐡𝐞 𝐬𝐭𝐨𝐫𝐲: Building something that works is easy. Building something that rarely fails is hard.




Check out the full course where I walk you through how to build this project from scratch:  https://neetcode.io/courses/full-stack-dev/0 

8 coding design patterns explained using real-world analogies.





(I also created a Leetcode style problem to implement each of these yourself - link at the end of this post).




𝐂𝐫𝐞𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬


1. Factory Method - Abstract away the details of constructing complex objects.
- Restaurants - you just order and receive the prepared food 🥗


2. Builder - A simple interface for constructing complex objects, which also allows fine-grained control on how it’s constructed (unlike Factory).
- Ordering food at Subway or Chipotle - you specify each ingredient but don’t have to make it yourself 🥪


3. Singleton - Enforce that at most one instance of a class may exist.
- Countries usually have at most one government (and sometimes none) 🏛️




𝐁𝐞𝐡𝐚𝐯𝐢𝐨𝐫𝐚𝐥 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬


1. Strategy - At runtime a strategy (algorithm) can be choosen & supplied to objects to modify their behavior.
- Snapchat & Instagram filters let you choose which animal you want to look like 🐶

2. Observer - Objects (observers) can listen for changes to another object (Subject), and be notified whenever changes occur.
- When you click the bell icon on my profile page 😉 you get a push notification whenever I post.



𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐚𝐥 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬


1. Adapter - Allow two otherwise incompatible objects to work together.
- Macbooks only have USB-C ports, but using adapters they are compatible with other connectors like USB-A 💻


2. Decorator - Add or modify behavior of an object at runtime without changing it’s base type.
- You can add sugar, cream, and more to coffee, but it’s still coffee ☕


3. Facade - Encapsulate several complex actions behind a single simple interface.
- Computers are a simple way for humans to interact with complex hardware components (RAM, disk, networks, etc) 🛜




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🚀 Implement each pattern yourself in Leetcode style practice problems:  https://neetcode.io/practice 

 #designpatterns   #objectorientedprogramming   #coding 

I coded "Leetcode for design patterns" on  https://neetcode.io/  for my recently launched Design Patterns course! 🚀

Everyone hates on leetcode, but I always liked that problems were "self-contained". It's easy to jump in and finish a problem without a lot of context. ✅

That's why I made leetcode-style problems to implement OOP design patterns. IMO it makes it easy to consistently solve a problem or two a day. And of course, consistent practice is the only way improve! ⏰


Check it out and lmk what you think! Really excited about this cause I don't think i've seen it anywhere else!
🚀  https://neetcode.io/problems/adapter 

Wholesome friday post from the NeetCode discord server!


Also, launching the OOP Design Patterns course this weekend! It includes "Leetcode for design patterns" - e.g. implement each design pattern as a LC style problem.

🚀  https://neetcode.io/ 

I grew up near Seattle so I wanted to go to the University of Washington for college (it's the 5th ranked CS school in the US).

But I had a bad GPA in high school and unfortunately got rejected 😭

Somehow I got invited to speak with the UW SWE career club, and got to meet some really talented students! LETS GOOOO

Thanks for having me UW! 🤓

and for letting me wear my wazzu hat :)


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🚀  https://neetcode.io/ 

✅ 24 hour stream leetcode stream



and i'm still alive 

When you grind so much leetcode that you build your own...  launching in a few days 🚀🚀🚀




 https://neetcode.io/