POP vs OOP decision patterns in Swift - When to Use Which

The Big Idea

Discover how choosing the right pattern can save your app from chaos and endless bugs!

The Scenario

Imagine building a simple app where you need to manage different types of users and their actions. You try to write all the code in one big class, mixing everything together.

The Problem

This approach quickly becomes messy and hard to change. Adding new user types or behaviors means rewriting big chunks of code, risking bugs and confusion.

The Solution

Using POP (Protocol-Oriented Programming) and OOP (Object-Oriented Programming) decision patterns helps organize your code clearly. You separate what things do (protocols) from how they do it (classes or structs), making your app easier to build and update.

Before vs After

✗ Before

class User {
  func action() {
    // all user actions mixed here
  }
}

✓ After

protocol Actionable {
  func action()
}

struct Admin: Actionable {
  func action() { /* admin action */ }
}

class Guest: Actionable {
  func action() { /* guest action */ }
}

What It Enables

This lets you add new behaviors or user types without breaking existing code, making your app flexible and robust.

Real Life Example

Think of a ride-sharing app where drivers and passengers have different actions. Using POP and OOP patterns helps you manage these roles cleanly and add new features easily.

Key Takeaways

Manual code mixing behaviors is hard to maintain.

POP and OOP separate roles and actions clearly.

This leads to easier updates and fewer bugs.