DRDevashish Royinroydevashish.hashnode.dev·Sep 11 · 5 min readSQL Query Interview Question: Cheat Sheet1. Find the Second Highest Salary SELECT MAX(e1.salary) FROM employee e1 WHERE e1.salary < ( SELECT MAX(e2.salary) FROM employee e2 ); 2. Find the Nth Highest Salary Option 1: Using LIMIT and00
DRDevashish Royinroydevashish.hashnode.dev·Nov 19, 2025 · 5 min readUnderstanding SOLID Principles — The Foundation of Better Software DesignI am currently working on the project YouTubeLayer. The prototype worked fine initially, but when I tried to move it to a working production system and scale it, everything started breaking. It felt like playing Jenga — touch one block, and the whole...00
DRDevashish Royinroydevashish.hashnode.dev·Oct 19, 2025 · 3 min readHigher Order Functions — Powering Modern JavaScript MagicWhen I first started working with JavaScript, I used to think functions were just blocks of code — something you call, they do their job, and that’s it. But as my projects grew — from simple scripts to complex API-driven dashboards — I discovered som...00
DRDevashish Royinroydevashish.hashnode.dev·Oct 15, 2025 · 5 min readFunctions are First-Class Citizens — What Does It Mean?Before understanding why functions are called first-class citizens in some programming languages and not in others, we need to understand what a first-class citizen means in a programming language. What is a First-Class Citizen? In programming, a fi...00
DRDevashish Royinroydevashish.hashnode.dev·Sep 21, 2025 · 2 min readDocker Command Sheet - My Go-To Dev EnvironmentA quick reference for commonly used Docker commands. Designed for everyday development, it shows how to build, run, manage, and push Docker images. Fully generalized with placeholders for paths, image names, container names, and ports. Minimal, non-r...00
