Swift Best Practices

Priority: P0

Implementation Guidelines

Control Flow

• Guard for Early Exit: Use guard over nested if for better readability.
• for-where: Use for item in items where condition instead of nested if.
• Switch Exhaustiveness: Always handle all cases; use @unknown default for enums.

Value Types & Immutability

• Prefer Structs: Use struct by default; classes only for reference semantics or inheritance.
• Immutability: Use let over var whenever possible.
• Copy-on-Write: Leverage Swift’s built-in COW for collections.

Naming & Style

• Clear Intent: isEnabled, hasData, canSubmit for Booleans.
• Avoid Abbreviations: userRepository not userRepo.
• Type Inference: Let compiler infer types unless clarity requires annotation.

Anti-Patterns

• Nested If: **No Pyramid of Doom**: Use guard.
• Mutable Globals: **No var at Global Scope**: Use constants or dependency injection.
• Force Try: **No try!**: Handle errors properly.

References

• Guard Patterns & Immutability