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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

5/5

LLD|⭐ SOLID Principles| 20 min

Dependency Inversion Principle

Intermediate20 min read+10 XP

TL;DR — Dependency Inversion Principle

Learn Dependency Inversion Principle — a key concept for LLD interviews.

Interactive — Try it yourself!

How to use

1Click "D" — Dependency Inversion

2See BAD code: OrderService hardcodes MySQLDB

3Click "✅ Good Code" — depends on Database interface

4Now MySQL, MongoDB, anything works — just implement the interface!

In a nutshell

DIP: High-level modules (business logic) shouldn't depend on low-level modules (database). Both should depend on abstractions (interfaces). Like a power plug — any lamp fits any outlet.

Interface Segregation Principle