Cookies vs JWT — Which Authentication Method Should You Use?

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Series Topic Level Read Time Web & HTTP Foundations — Part 4 of 12 Authentication — Cookies vs JWT Beginner to Intermediate ~17 minutes 📌  This is Part 4 of the Web & HTTP Foundations series. Part 3 covered HTTP Headers in depth — specifically the Authorization header and Set-Cookie header which are central to … Read more

HTTP Headers Explained — The Complete Backend Developer Guide

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Series Topic Level Read Time Web & HTTP Foundations — Part 3 of 12 HTTP Headers — All Categories Deep Dive Beginner to Intermediate ~16 minutes 📌  This is Part 3 of the Web & HTTP Foundations series. Part 1 covered the HTTP Request Lifecycle. Part 2 covered HTTP Methods and Idempotency. Read those first … Read more

LeetCode 680 — Valid Palindrome II | Full Solution Explained

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Difficulty Pattern Asked At LeetCode Link Easy Two Pointers Facebook, Amazon, Google, Microsoft leetcode.com/problems/valid-palindrome-ii 📌  This problem is a direct follow-up to LeetCode 125 — Valid Palindrome. If you haven’t read that post yet, start there — it covers the Two Pointers palindrome template that this problem builds on. Valid Palindrome II is one of … Read more

HTTP Methods Explained — GET, POST, PUT, PATCH, DELETE and Everything In Between

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Series Topic Level Read Time Web & HTTP Foundations — Part 2 of 12 HTTP Methods, Idempotency & Safety Beginner to Intermediate ~14 minutes 📌  This is Part 2 of the Web & HTTP Foundations series. Part 1 covered the full HTTP Request Lifecycle — read that first if you haven’t already. Every API call … Read more

HTTP Request Lifecycle Explained — What Really Happens When You Hit Enter

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You type https://google.com into your browser and press Enter. In about 200 milliseconds, a fully rendered page appears. But what actually happened in those 200 milliseconds? Most developers — even experienced ones — have a vague idea. ‘DNS happens, then TCP, then… HTTP stuff.’ But if you’re building backends, designing APIs, debugging slow responses, or … Read more

LeetCode 125 — Valid Palindrome | Full Solution Explained

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Difficulty Pattern Asked At LeetCode Link Easy Two Pointers (Opposite Ends) Facebook, Microsoft, Apple, Uber leetcode.com/problems/valid-palindrome 📌  This is part of the Two Pointers series on Daily Dev Notes. LeetCode 125 is the perfect first Two Pointers problem to solve — it’s easy, clean, and teaches you the exact same pattern used in harder problems … Read more

LeetCode 11 — Container With Most Water | Full Solution Explained

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Difficulty Pattern Asked At LeetCode Link Medium Two Pointers (Opposite Ends) Amazon, Google, Microsoft, Bloomberg, Apple leetcode.com/problems/container-with-most-water 📌  This is part of the Two Pointers series on Daily Dev Notes. If you haven’t read the Two Pointers pattern guide yet, start there — it will make this solution much easier to understand. This problem has … Read more

LeetCode 167 — Two Sum II (Input Array Is Sorted) | Full Solution Explained

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Difficulty Pattern Companies Leetcode Link Medium Two Pointers Amazon, Google, Microsoft, Adobe leetcode.com/problems/two-sum-ii-input-array-is-sorted 📌  Before reading this post, I recommend reading the Two Pointers Pattern Guide on this blog. It will make this solution click much faster. If you’ve solved the original Two Sum (LeetCode #1), you might think this is the same problem. It’s … Read more

Two Pointers Pattern in DSA — Complete Guide for Beginners

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 This is a pattern guide. After reading this, you will be able to recognise and solve Two Pointers problems confidently — not just memorise one solution. Let me ask you something. Have you ever solved a LeetCode problem by running two loops — one inside the other — and it worked fine on small inputs … Read more