Quick Answer

Enums with associated values and methods

Understanding the Issue

Swift enums are much more powerful than in other languages. They can have associated values, methods, and conform to protocols. They're ideal for state modeling.

The Problem

This code demonstrates the issue:

Swift Error 
// Problem: Basic enum
enum Direction {
    case north, south, east, west
}

The Solution

Here's the corrected code:

Swift Fixed 
// Solution: Advanced enum
enum Result {
    case success(data: Data)
    case failure(error: Error)
    
    func analyze() {
        switch self {
        case .success(let data):
            process(data)
        case .failure(let error):
            handle(error)
        }
    }
}

Key Takeaways

Use enums to model finite states with associated data.