--- title: "#coderarmy articles | Hashnode" description: "Explore 52 articles tagged #coderarmy on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/coderarmy" --- Tag # #coderarmy 52 posts · 0 followers [RAJU KUMAR](https://hashnode.com/@techincalrajukmr) · [Aug 14](https://hashnode.com/posts/backend-basic/6a7e99f7532b7679dd01ecbb) ### [Backend Basic](https://webwarriors.hashnode.dev/backend-basic?utm_source=hashnode&utm_medium=feed) Lecture01 to 05: Introduction to NodeJs Introduction to Backend — Why Does It Exist? Start From What You Already Know You know JavaScript. You built frontend applications. Button clicks. DOM manipula 35 min read · [webwarriors.hashnode.dev](https://webwarriors.hashnode.dev/backend-basic?utm_source=hashnode&utm_medium=feed) [Muhammad Huzaifa](https://hashnode.com/@mhuzaifariz) · [Feb 24](https://hashnode.com/posts/free-ai-tools-every-coder-should-know/699d853876cf0888f4a84289) ### [FREE AI Tools Every Coder Should Know](https://mhuzaifaar.hashnode.dev/free-ai-tools-every-coder-should-know?utm_source=hashnode&utm_medium=feed) Trae AI, DeepSeek Coder, and Firebase Gemini let you build full apps without paying for Cursor or Claude. Three FREE AI Tools for coders 6 min read · [mhuzaifaar.hashnode.dev](https://mhuzaifaar.hashnode.dev/free-ai-tools-every-coder-should-know?utm_source=hashnode&utm_medium=feed) [Joydeep Garai](https://hashnode.com/@JoydeepG01) · [Jan 30](https://hashnode.com/posts/understanding-html-tags-and-elements/697ca7a2ac851c9d21b58072) ### [Understanding HTML Tags and Elements:](https://joydeep-garai-blogs.hashnode.dev/understanding-html-tags-and-elements?utm_source=hashnode&utm_medium=feed) Introduction: HTML as the Skeleton of a Webpage Every webpage you see on the internet is built on a structural foundation. That foundation is HTML (HyperText Markup Language). HTML defines the structure and meaning of content on the web, much like a ... 4 min read · [joydeep-garai-blogs.hashnode.dev](https://joydeep-garai-blogs.hashnode.dev/understanding-html-tags-and-elements?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 7, 2025](https://hashnode.com/posts/week-8-day-5-ending-strong-null-object-pattern-anti-patterns-and-system-design-insights/686b9f2206397781933da60c) ### [📅Week 8 (Day-5) – Ending Strong: Null Object Pattern, Anti-Patterns & System Design Insights](https://payaltechbolg11.hashnode.dev/week-8-day-5-ending-strong-null-object-pattern-anti-patterns-and-system-design-insights?utm_source=hashnode&utm_medium=feed) Wrapping Up Week 8: Dive into Null Object Pattern, Understand Anti-Patterns, and Gain System Design Knowledge 5 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-8-day-5-ending-strong-null-object-pattern-anti-patterns-and-system-design-insights?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/week-8-day-5-ending-strong-null-object-pattern-anti-patterns-and-system-design-insights/686b9f2206397781933da60c) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 7, 2025](https://hashnode.com/posts/week-8-day-4-system-design-exploring-the-memento-design-pattern-with-uml-and-coding/686b842548fe67f4ad741ac6) ### [📅Week 8 (Day-4) - System Design: Exploring the Memento Design Pattern with UML and Coding](https://payaltechbolg11.hashnode.dev/week-8-day-4-system-design-exploring-the-memento-design-pattern-with-uml-and-coding?utm_source=hashnode&utm_medium=feed) Explore the Memento Design Pattern: UML Diagrams and Code Explained 3 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-8-day-4-system-design-exploring-the-memento-design-pattern-with-uml-and-coding?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 6, 2025](https://hashnode.com/posts/week-8-day-3-understanding-the-visitor-design-pattern-in-system-design/686a5b342733e2ea2b88d5ef) ### [📅Week-8 (Day-3) - Understanding the Visitor Design Pattern in System Design](https://payaltechbolg11.hashnode.dev/week-8-day-3-understanding-the-visitor-design-pattern-in-system-design?utm_source=hashnode&utm_medium=feed) Learn the Visitor Design Pattern: UML Diagrams and Code Examples 5 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-8-day-3-understanding-the-visitor-design-pattern-in-system-design?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 5, 2025](https://hashnode.com/posts/week-8-day-2-how-to-design-a-chess-game-system-step-by-step-guide/6868d87657e55ecf4250abfc) ### [📅Week-8 (Day-2) - How to Design a Chess Game System: Step-by-Step Guide](https://payaltechbolg11.hashnode.dev/week-8-day-2-how-to-design-a-chess-game-system-step-by-step-guide?utm_source=hashnode&utm_medium=feed) Step-by-Step Chess Game Design: UML Diagrams and Coding 20 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-8-day-2-how-to-design-a-chess-game-system-step-by-step-guide?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 3, 2025](https://hashnode.com/posts/week-8-day-1-how-to-implement-prototype-design-pattern-a-guide-with-uml-and-code/68670e05262f7042431f00e3) ### [📅Week-8 (Day-1) - How to Implement Prototype Design Pattern: A Guide with UML and Code](https://payaltechbolg11.hashnode.dev/week-8-day-1-how-to-implement-prototype-design-pattern-a-guide-with-uml-and-code?utm_source=hashnode&utm_medium=feed) Learn Prototype Design Patterns with UML and Code Examples 5 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-8-day-1-how-to-implement-prototype-design-pattern-a-guide-with-uml-and-code?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 3, 2025](https://hashnode.com/posts/week-7-day-5-how-to-create-a-chat-room-using-the-mediator-design-pattern-uml-and-coding-guide/68663117df1884f07f04e8cf) ### [📅Week-7 (Day-5) - How to Create a Chat Room Using the Mediator Design Pattern: UML and Coding Guide](https://payaltechbolg11.hashnode.dev/week-7-day-5-how-to-create-a-chat-room-using-the-mediator-design-pattern-uml-and-coding-guide?utm_source=hashnode&utm_medium=feed) Design a Chat Room with the Mediator Pattern Using UML and Code 7 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-7-day-5-how-to-create-a-chat-room-using-the-mediator-design-pattern-uml-and-coding-guide?utm_source=hashnode&utm_medium=feed) [Payal Kumari](https://hashnode.com/@Payal11) · [Jul 2, 2025](https://hashnode.com/posts/week-7-day-3-create-a-tic-tac-toe-game-complete-guide-with-uml-and-code-example/686530fe765ecfac0943177e) ### [📅Week-7 (Day-3) - Create a Tic Tac Toe Game: Complete Guide with UML and Code Example](https://payaltechbolg11.hashnode.dev/week-7-day-3-create-a-tic-tac-toe-game-complete-guide-with-uml-and-code-example?utm_source=hashnode&utm_medium=feed) How to Build a Tic Tac Toe Game with UML and Code Examples 8 min read · [payaltechbolg11.hashnode.dev](https://payaltechbolg11.hashnode.dev/week-7-day-3-create-a-tic-tac-toe-game-complete-guide-with-uml-and-code-example?utm_source=hashnode&utm_medium=feed)