Learn SWIFT with Real Code Examples
Updated Nov 21, 2025
Performance Notes
Optimize algorithms with Swift’s value types
Avoid retain cycles using weak/unowned references
Use lazy properties for expensive initializations
Minimize frequent UI updates in SwiftUI
Profile memory and CPU using Instruments
Security Notes
Use optionals to prevent nil crashes
Validate user input
Use Keychain for sensitive data storage
Follow secure networking practices with HTTPS
Apply app sandboxing for resource protection
Monitoring Analytics
Use Instruments for profiling
Xcode debugger for runtime inspection
Crashlytics or Sentry for error reporting
Monitor memory and CPU usage
Track app performance and analytics
Code Quality
Lint code with SwiftLint
Unit test with XCTest
Integration tests for app features
Code reviews and modularization
Documentation using SwiftDoc or Xcode comments