swift

name	swift
description	Google's official Swift style guide. Covers naming conventions, optionals, protocols, error handling, access control, formatting, and Swift best practices.

Google Swift Style Guide

Official Google Swift coding standards for consistent, maintainable iOS/macOS code.

Golden Rules

1. Clear, descriptive names — readability at the call site
2. Prefer let over var — immutability by default
3. Use optionals properly — avoid force unwrapping (!)
4. Protocol-oriented programming — prefer protocols over inheritance
5. guard for early returns — reduce nesting with early exits
6. Use type inference — let Swift infer types when obvious
7. SwiftLint for consistency — automate style enforcement

Quick Reference

Naming Conventions

Element	Convention	Example
Types (class/struct/enum/protocol)	UpperCamelCase	UserService
Functions/Methods	lowerCamelCase	getUserById
Variables/Properties	lowerCamelCase	userCount
Constants	lowerCamelCase	maxRetries
Enums	UpperCamelCase	Direction