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HLD LLD Agentic AI

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📚LLD Introduction

Introduction to LLD

🎯OOP Fundamentals

Classes & Objects

🔗Class Relationships

💡Design Principles

YAGNI Principle

Clean Code Practices

⭐SOLID Principles

Single Responsibility Principle

Open/Closed Principle

Liskov Substitution Principle

Interface Segregation Principle

Dependency Inversion Principle

📊UML Diagrams

Sequence Diagrams

Use Case Diagrams

🎨Additional Patterns

Factory Pattern

Singleton Pattern

Observer Pattern

Strategy Pattern

Decorator Pattern

Adapter Pattern

Builder Pattern

Command Pattern

Template Method Pattern

💼LLD Interview Tips

LLD Interview Approach

Common LLD Mistakes

Evaluation Criteria

❓LLD Interview Questions

Design Parking Lot

Design Elevator System

Design Library System

Design Vending Machine

Design Chess Game

Design Hotel Booking

Design Snake & Ladder

Design Tic Tac Toe

Design Movie Booking

Design Chat Application

Design Splitwise

Design Food Delivery

Design Cricinfo

Design Logger System

Design File System

Design Social Network

Design Stack Overflow

Design Online Auction

4/4

LLD|💡 Design Principles| 15 min

Clean Code Practices

Intermediate15 min read+10 XP

TL;DR — Clean Code Practices

Learn Clean Code Practices — a key concept for LLD interviews.

Interactive — Try it yourself!

How to use

1See variables with cryptic names: x, y, d

2Drag the naming quality slider to the right

3Watch names transform: x→activeUser, y→orderTotal, d→deliveryDate

4See readability score jump from 2/10 to 9/10

In a nutshell

Clean code is readable, maintainable, and self-documenting. Use meaningful names, keep functions short, handle errors properly, and write code your future self will thank you for.

YAGNI Principle

Single Responsibility Principle