--- title: "Madhusudan Das (@XDEV200) | Hashnode" description: "Received Understand Accept. Read the latest articles by Madhusudan Das on Hashnode." url: "https://hashnode.com/@XDEV200" --- @XDEV200 # Madhusudan Das @XDEV200 · Jamshedpur · Joined October 2020 Received Understand Accept [Website](https://xdev200-folio.vercel.app/) ### [Difference Between undeclared, undefined, and null](https://xdev.hashnode.dev/difference-between-undeclared-undefined-and-null?utm_source=hashnode&utm_medium=feed) "Undeclared" means the variable has not been declared or defined in the current scope. "Undefined" means the variable has been declared but not assigned a 1 min read · [xdev.hashnode.dev](https://xdev.hashnode.dev/difference-between-undeclared-undefined-and-null?utm_source=hashnode&utm_medium=feed) [Sep 27, 2023](https://hashnode.com/posts/difference-between-undeclared-undefined-and-null/6513b5bb391f8b377b631c4c) ### [Scope, For Your { } Only](https://xdev.hashnode.dev/scope-in-javascript?utm_source=hashnode&utm_medium=feed) The scope is one of the important concepts in JavaScript, it manages the availability of variables. If you would like to code in JavaScript, you must understand the scope. Scope The Scope is the accessibility of variables, functions, and objects ... 3 min read · [xdev.hashnode.dev](https://xdev.hashnode.dev/scope-in-javascript?utm_source=hashnode&utm_medium=feed) [Jun 16, 2021](https://hashnode.com/posts/scope-in-javascript/60c9a4eb148304124fdd19bf) ### [JavaScript Execution Context In an Easy Way.](https://xdev.hashnode.dev/javascript-execution-context-in-an-easy-way?utm_source=hashnode&utm_medium=feed) Have you ever thought about what happens when you run a JavaScript program? If you are or want to be a JavaScript developer, you must know what happens when you run your JS program or how the JavaScript Programs get executed internally. To know what... 3 min read · [xdev.hashnode.dev](https://xdev.hashnode.dev/javascript-execution-context-in-an-easy-way?utm_source=hashnode&utm_medium=feed) [Jun 4, 2021](https://hashnode.com/posts/javascript-execution-context-in-an-easy-way/60b9cd16e7631679eb8de4b5) ### [My First NPM Package](https://xdev.hashnode.dev/my-first-npm-package?utm_source=hashnode&utm_medium=feed) It was an exciting experience whenever you create something for the first time. For me, it is my first NPM package and also my first Open source contribution. In this article, I will describe how easy to publish NPM Package. Step 1: npm account npm... 2 min read · [xdev.hashnode.dev](https://xdev.hashnode.dev/my-first-npm-package?utm_source=hashnode&utm_medium=feed) [Feb 6, 2021](https://hashnode.com/posts/my-first-npm-package/601eca9a072bc516ff6f5937) ### [Must-Have 15 Chrome Extension For Developer's Productivity](https://xdev.hashnode.dev/must-have-15-chrome-extension-for-developers-productivity-1?utm_source=hashnode&utm_medium=feed) 30 Seconds of Knowledge - Web Extension that lets you gain new developer skills, every time you open a New Tab. Source Bitly | Powerful Short Links - Create short, customized, powerful links from any page and share them with the world. source Color... 2 min read · [xdev.hashnode.dev](https://xdev.hashnode.dev/must-have-15-chrome-extension-for-developers-productivity-1?utm_source=hashnode&utm_medium=feed) [Jan 26, 2021](https://hashnode.com/posts/must-have-15-chrome-extension-for-developers-productivity-1/601033a8b5b03f4bf00e3b2a)