Code Review & Refactoring Suggestions

Analyze Swift code and provide actionable refactoring suggestions focused on clarity, maintainability, performance, and modern Swift best practices.

Review Focus Areas

1. Clarity & Readability

• Self-documenting code with clear names
• Avoid overly complex expressions
• Comment long or complex logic blocks

2. Swift Best Practices

• Value vs. Reference Types: Could a class be a struct?
• Immutability: Use let instead of var wherever possible
• Control Flow: Use guard for early exits
• Functional Programming: Replace imperative loops with map, filter, compactMap
• API Design: Intuitive public API that hides implementation details

3. Architectural Principles

• Single Responsibility Principle (SRP): One reason to change per type
• Don't Repeat Yourself (DRY): Extract duplicated code
• Dependency Inversion: Use protocols for easier testing and dependency injection

Output Format

# Refactoring Suggestions for [FileName]

[If no issues: "No major refactoring opportunities were identified. The code is clean and well-structured."]

---
**Suggestion:** [Brief summary of recommended change]

**Location:** [Line number or function/property name]

**Reasoning:** [Why this change is recommended, referencing specific principles]

**Example:**
```swift
// Before
...
// After
...

---

## Example Review

For code with issues:

```markdown
# Refactoring Suggestions for TemperatureConverter.swift

---
**Suggestion:** Consider making `TemperatureConverter` a struct instead of a class

**Location:** Line 3 (class declaration)

**Reasoning:** This type has no inheritance requirements and leverages value semantics would be more appropriate. Structs are preferred in Swift for data-centric types without identity requirements.

**Example:**
```swift
// Before
class TemperatureConverter {
    var celsius: Double
}

// After
struct TemperatureConverter {
    var celsius: Double
}

---

Suggestion: Replace var with let for immutable property

Location: Line 12 (threshold property)

Reasoning: This property is never reassigned after initialization. Using let makes the immutability explicit and prevents accidental modifications.

## Tone
Constructive and educational - explain the "why" behind each suggestion.