#30-days-of-code articles

MMMustapha Muhammad Ibrahimmlbro.hashnode.devJul 6 · 5 min read

Day 03 - 06

30 Days of Machine Learning & AI : Days 3–6 From Raw Weather Data to Machine Learning Features After spending the first two days building the project's foundation—connecting to the Open-Meteo API and

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MMMustapha Muhammad Ibrahimmlbro.hashnode.devJul 2 · 6 min read

30 Days of Machine Learning & AI: Day 2 — Building the Data Pipeline with PostgreSQL One of the biggest lessons I'm learning from this challenge is that machine learning starts long before you train a

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TTanishicodingchallenge.hashnode.devJan 8 · 2 min read

Day 9 – Intersection of Two Linked Lists | Two Pointer | LeetCode Challenge

🗓️ Date: January 9, 2026📌 Challenge:🧩 Problem: Intersection of Two Linked Lists – LeetCode #160 (Easy)💻 Topic: Two Pointer, Linked List ✅ Problem Statement (Summary): Goal: Given the heads of two singly linked lists headA and headB, return the n...

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TTanishicodingchallenge.hashnode.devJan 7 · 2 min read

Day 8 – Linked List Cycle & Middle of the Linked List | Slow and Fast Pointer | LeetCode Challenge

🗓️ Date: January 8, 2026📌 Challenge:🧩 Problem 1: Linked List Cycle – LeetCode #141 (Easy)🧩 Problem 2: Middle of the Linked List – LeetCode #876 (Easy)💻 Topic: Two Pointer, Linked List, Fast & Slow Pointer ✅ Problem Statement (Summary): 🔹 Probl...

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SASartaj Ahmad Hajamawsterraform30days.hashnode.devNov 30, 2025 · 6 min read

30 Days of Terraform (AWS) — Days 3–6 (Combined)

I’ve been busy the past few days so I’m combining Days 3–6 into one post. From Day 7 onward I’ll publish a separate post for each day again. Overview (what we cover in this post) Day 3 — AWS Authentication & S3 bucket basics (Terraform + AWS credent...

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SASartaj Ahmad Hajamawsterraform30days.hashnode.devNov 27, 2025 · 3 min read

🚀 Day 2 of My #30DaysOfAWSTerraform Journey

After completing Day 1, I felt much more comfortable with the basics of IaC.Today, I took a deeper dive into something that Terraform absolutely cannot function without — Providers. This turned out to be one of those topics that looks simple from the...

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YCYash Chavdayashchavda.hashnode.devSep 10, 2025 · 2 min read

What I Learned From Failing My 30-Day Product Challenge

I took on a 30-day product-building challenge. I made meaningful progress for 15 days, then hit a wall. Here’s what went wrong, what I learned, and how I’m rebooting with a tighter MVP. Where Things Went Wrong Missing product fundamentals: I jumped ...

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AAyushayush-devhub.hashnode.devAug 31, 2025 · 3 min read

Day 4: Java Console Based Student Grade Manager

What I Built Today Today, I built a console-based Student Grade using Java. This project uses an ArrayList, Hash Map and txt file to track grades. Users can perform the following operations: Add a student. Add subjects & marks for the respective st...

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AAyushayush-devhub.hashnode.devAug 30, 2025 · 3 min read

Day 3: Java Console Based Expense Tracker

What I Built Today Today, I built a console-based Expense Tracker using Java. This project uses an ArrayList and CSV file to track expenses. Users can perform the following operations: Add expenses (category, amount, note, date). View all expenses....

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AAyushayush-devhub.hashnode.devAug 29, 2025 · 2 min read

Day 2: Java CLI Based Library Book Tracker

What I Built Today Today I worked on a console-based Library Book Tracker. Users can: add books check books out return books list all books (both available & checked out) We use an ArrayList to keep track of books. What I Struggled With Fixing...

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Day 03 - 06

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Day 9 – Intersection of Two Linked Lists | Two Pointer | LeetCode Challenge

Day 8 – Linked List Cycle & Middle of the Linked List | Slow and Fast Pointer | LeetCode Challenge

30 Days of Terraform (AWS) — Days 3–6 (Combined)

🚀 Day 2 of My #30DaysOfAWSTerraform Journey

What I Learned From Failing My 30-Day Product Challenge

Day 4: Java Console Based Student Grade Manager

Day 3: Java Console Based Expense Tracker

Day 2: Java CLI Based Library Book Tracker

#30-days-of-code

Search Hashnode

#30-days-of-code

Explore Hashnode

Trending tags this week

Day 03 - 06

Day-02

Day 9 – Intersection of Two Linked Lists | Two Pointer | LeetCode Challenge

Day 8 – Linked List Cycle & Middle of the Linked List | Slow and Fast Pointer | LeetCode Challenge

30 Days of Terraform (AWS) — Days 3–6 (Combined)

🚀 Day 2 of My #30DaysOfAWSTerraform Journey

What I Learned From Failing My 30-Day Product Challenge

Day 4: Java Console Based Student Grade Manager

Day 3: Java Console Based Expense Tracker

Day 2: Java CLI Based Library Book Tracker