Swift Structure

This skill covers Swift’s core language structures and features for building robust applications.

Overview

Swift structure skills cover the fundamental building blocks of the language: collections, optionals, control flow, closures, and other essential language features.

Available References

Collections

• Array – Ordered collections, map/filter/reduce operations
• Dictionary – Key-value pairs, lookups, transformations
• Set – Unique elements, set algebra operations

Language Features

• Optionals – Optional binding, unwrapping, nil handling
• Closures – Closure expressions, trailing closure syntax
• Generics – Generic types, constraints, associated types
• Extensions – Type extensions, computed properties
• Control Flow – Conditionals, loops, pattern matching
• Error Handling – Throws, do-catch, Result type

Data Types

• Strings – String manipulation, interpolation, Unicode

Quick Reference

Collections Comparison

Optional Handling

// Optional binding
if let value = optional { }
guard let value = optional else { return }

// Nil coalescing
let value = optional ?? defaultValue

// Optional chaining
let result = object?.property?.method()

Common Higher-Order Functions

array.map { $0 * 2 }           // Transform
array.filter { $0 > 0 }         // Select
array.reduce(0, +)              // Combine
array.compactMap { Int($0) }    // Transform + remove nil
array.flatMap { $0 }            // Flatten

Best Practices

1. Use appropriate collection – Match collection to use case
2. Handle optionals safely – Never force unwrap without certainty
3. Leverage higher-order functions – Cleaner functional code
4. Use extensions for organization – Group related functionality
5. Prefer generics for reusability – Type-safe flexible code
6. Make switch exhaustive – Handle all cases
7. Use do-catch properly – Handle errors appropriately

For More Information

Each reference file contains detailed information, code examples, and best practices for specific topics. Visit https://swiftzilla.dev for comprehensive Swift documentation.