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swift-language

Apply modern Swift language patterns to non-concurrency, non-SwiftUI code.

3|Updated Mar 13, 2026
Search Tags:#best practices#syntax#swift#programming#language features#codable
One-click install
npx skills add https://github.com/andrew-d/claude-skills --skill swift-language-andrew-d
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-language
Source: https://github.com/andrew-d/claude-skills/tree/main/plugins/swift-ios-skills--swift-core-skills/skills/swift-language
Command: npx skills add https://github.com/andrew-d/claude-skills --skill swift-language-andrew-d

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write more idiomatic, efficient, and modern Swift code by leveraging advanced language features and patterns.

Core Features & Use Cases

  • Modern Syntax: Utilize Swift 5.9+ features like if/switch expressions and Swift 6+ typed throws.
  • Type System: Understand and apply opaque (some) and existential (any) types, property wrappers, and the Never type.
  • Data Handling: Implement best practices for Codable and leverage modern collection APIs and FormatStyle for concise data manipulation.
  • Use Case: Refactor a complex conditional assignment into a clean if expression, or implement a custom property wrapper to manage UserDefaults persistence.

Quick Start

Use the swift-language skill to refactor a series of nested if-else statements into a more readable guard pattern.

Frequently Asked Questions about swift-language

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I use Swift if and switch expressions to refactor complex conditional assignments?▼

Swift 5.9+ if and switch expressions allow you to assign values directly from conditionals, reducing nested if-else blocks into clean, readable guard patterns and modern syntax.

What's the best way to implement custom property wrappers for UserDefaults persistence in Swift?▼

Custom property wrappers in Swift encapsulate UserDefaults storage logic, enabling you to expose persisted values as simple typed properties rather than writing repetitive getter and setter code.

How does Swift typed throws work and when should I use it in my code?▼

Swift 6+ typed throws specify the exact error type a function can throw, enhancing compile-time safety and allowing callers to handle specific errors without broad catch blocks.

When do I need to use opaque some types versus existential any types in Swift?▼

Opaque types hide concrete types behind a fixed protocol interface for performance, while existential types use dynamic dispatch for heterogeneous values, trading runtime flexibility for slight overhead.

What are the best practices for implementing Codable to handle custom data mapping in Swift?▼

Codable best practices involve leveraging custom encoding and decoding strategies to map JSON keys cleanly, handling nested data structures safely without fragile manual string parsing.

How do I use Swift Regex builders and FormatStyle for concise data validation?▼

Swift Regex builders construct pattern matching logic natively, while FormatStyle provides localized, type-safe formatting for dates and numbers, replacing verbose manual string processing.

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