How's your data structure knowledge these days? | Null safety in Dart | Fresh info on iOS, Android, Flutter and more

[raywenderlich.com]( Weekly Newsletter Issue 328 · Jun 30 2021 Hello {NAME} 👋 We've got a roundup of our latest content, with a freshly-updated book on data structures and algorithms, not one but two Flutter articles on null safety and building complex UI, along with an exploration of using composition in your Kotlin code, and finally, implementing Redux in your SwiftUI app! Books [Data Structures & Algorithms in Kotlin]( [Data Structures & Algorithms in Kotlin]( [Data Structures & Algorithms in Kotlin]( Android & Kotlin [A book that teaches you the fundamental tools of implementing key data structures in Kotlin, and how to use them to solve algorithms.]( [Check out the book →]( [Check out the book →]( Articles [Getting a Redux Vibe Into SwiftUI]( [Getting a Redux Vibe Into SwiftUI]( [Learn how to implement Redux concepts to manage the state of your SwiftUI app in a more predictable way by implementing a matching-pairs card game.]( iOS & Swift · 31 min  [bookmark](  [Read now →]( [Learn how to implement Redux concepts to manage the state of your SwiftUI app in a more predictable way by implementing a matching-pairs card game.]( [Read now →]( [Using Composition in Kotlin]( [Using Composition in Kotlin]( [Learn how composition makes your Kotlin code more extensible and easy to maintain.]( Android & Kotlin · 31 min  [bookmark](  [Read now →]( [Learn how composition makes your Kotlin code more extensible and easy to maintain.]( [Read now →]( [Building Complex UI in Flutter: Magic 8-Ball]( [Building Complex UI in Flutter: Magic 8-Ball]( [Learn how to build complex user interfaces in Flutter by creating a nearly 3D Magic 8-Ball using standard Flutter components.]( Flutter · 33 min  [bookmark](  [Read now →]( [Learn how to build complex user interfaces in Flutter by creating a nearly 3D Magic 8-Ball using standard Flutter components.]( [Read now →]( [Non-Nullable Dart: Understanding Null Safety]( [Non-Nullable Dart: Understanding Null Safety]( [Learn how to use null safety in Dart. Get to know Dart’s type system and how to utilize language features in production code.]( Flutter · 29 min  [bookmark](  [Read now →]( [Learn how to use null safety in Dart. Get to know Dart’s type system and how to utilize language features in production code.]( [Read now →]( SPONSORED [Struggling to configure ProGuard or R8?]( [Configuring ProGuard or R8 can often be complex. Using the right tools such as the ProGuard Playground, which helps you to write -keep rules more efficiently through visualisation, can greatly improve the process. Read Guardsquare’s latest blog post to discover how they leveraged tools and best practices to configure ProGuard for the DuckDuckGo app.]( Fun fact: Did you know you could reach over 100K+ subscribers with our newsletter, if you sponsored it? [Learn more]( [raywenderlich.com Subscription]( [raywenderlich.com]( To make sure you keep getting these emails, please add newsletter@raywenderlich.com to your address book or put us on your email allow list. Want out of the loop? [Unsubscribe](. Our postal address: 1882 Hawksbill Rd, McGaheysville, VA 22840 [facebook]([twitter](