Swift Structure

Overview

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