Stubborn_since_2k

📘 Strategy Design Pattern Definition The Strategy Design Pattern is a behavioral design pattern that allows you to define a family of algorithms, encapsulate them in separate classes, and make them interchangeable at runtime . In simple terms: 👉 Instead of writing many if-else conditions , we separate algorithms into different classes and choose them dynamically . 🧠 Problem Without Strategy Pattern Imagine a payment system . You support: Credit Card PayPal UPI ❌ Bad Design (Using if-else) class PaymentProcessor: def process_payment(self, payment_type, amount): if payment_type == "credit": print(f"Processing credit card payment of {amount}") elif payment_type == "paypal": print(f"Processing PayPal payment of {amount}") elif payment_type == "upi": print(f"Processing UPI payment of {amount}") Problems ❌ Violates Open Closed Principle ❌ Hard to extend ❌ Too m...

  📘 System Design System Design is the process of planning and defining the architecture, components, modules, interfaces, and data flow of a system so that it meets the required functionality, performance, scalability, and reliability. In simple terms, system design explains how a software system should be structured and how its parts interact to solve a problem. 1️⃣ Definition System Design is the high-level and low-level design of a software system that transforms requirements into a structured solution. It defines: How different components interact How data flows through the system How the system handles scale, failures, and performance 2️⃣ Goals of System Design 🎯 The main objectives are: Scalability – System should handle increasing users or data. Reliability – System should work consistently without failures. Availability – System should be accessible most of the time. Performance – System should respond quickly. Maintainability – Easy to update and fix. Security ...