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DroidConEgypt-21-10-2022-Coroutines-AhmedNabil.pdf
The document details Ahmed Nabil's presentation on transitioning from callback hell to Kotlin coroutines, highlighting his extensive background in mobile app development and Kotlin's capabilities since its inception. It discusses various asynchronous programming strategies, including threading, callbacks, futures, promises, and reactive extensions, emphasizing the limitations of each. Finally, it introduces coroutines as a lightweight, thread-safe solution for asynchronous coding in Kotlin that facilitates simple error handling and debugging.
DroidConEgypt-21-10-2022-Coroutines-AhmedNabil.pdf
- 1. A Journey from CallbackHell to Kotlin Coroutines Ahmed Nabil Kotlin Egypt @AhmedNMahran Fri. Oct 21 2022
- 2. About Me About Me ●Writing Code since I was 11 ● ~10 years in Mobile App development ● Given talks to thousands of audiences ● Prev. Android Mentor at 1M Arab Coders. ● Worked at Hungerstation,Codly, and others. ● Software Tech. Lead at Vodafone (_VOIS). ● Head of Kotlin Egypt. ● Content creator (videos/articles) Fri. Oct 21 2022
- 3. About Me What is Kotlin? Fri. Oct 21 2022
- 4. About Me Kotlin ● Amodern Programming Language. ● Developed by Jetbrains & Open-Source community ● Since 2010. ● Current Stable Version is 1.7.20 (as of 20-10-2022) Fri. Oct 21 2022
- 5. About Me Used todevelop ● Multiplatform-Mobile ● Server-Side ● Web Front-End ● Android ● WatchOS ● Data Science ● and more Fri. Oct 21 2022
- 6. About Me Let the journey Begin Fri.Oct 21 2022
- 7. Fri. Oct 212022
- 8. Fri. Oct 212022
- 9. About Me ANR ● anyoperation > 16ms may cause Lag ● I/O operations, long-running operation ● Main thread should ONLY do UI operations Fri. Oct 21 2022
- 10. Fri. Oct 212022
- 11. About Me Problem Code runningin Main thread causing Crash or Lag. Fri. Oct 21 2022
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- 13. About Me Approaches ● Threading ●Callbacks ● Futures, Promises ● Reactive Extensions (Rx) ● Coroutines Fri. Oct 21 2022
- 14. About Me Threads A programsplits itself into 2 or more running tasks Fri. Oct 21 2022
- 15. About Me Threads Limitations ●Expensive ● Not Infinite, limited with device capabilities ● Not always available, (e.g. JS doesn’t have threading) ● Hard to Error-handle and debug Fri. Oct 21 2022
- 16. Fri. Oct 212022
- 17. About Me Callbacks a functionsent as an argument to another function to be executed at certain point in time. Fri. Oct 21 2022
- 18. Fri. Oct 212022
- 19. About Me Callback Limitations ●Nested Callbacks not easy to understand ● Hard to Error-handle and debug Fri. Oct 21 2022
- 20. Fri. Oct 212022
- 21. About Me Futures and Promises Ipromise I’ll return at some point in the future. Fri. Oct 21 2022
- 22. About Me Limitations ● NestedCallbacks not easy to understand ● Return Type : Needs changing the models (extra steps in getting the data) ● Hard to Error-handle and debug Fri. Oct 21 2022
- 23. About Me Rx Everything isa stream and it’s observable Needs learning new apis :( Fri. Oct 21 2022
- 24. About Me Coroutines Kotlin’s approachto work with async. code Fri. Oct 21 2022
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- 26. About Me Coroutines ● Nonew apis needed, same language used (kotlin) ● Return type doesn’t change. ● Write sequential code while being thread-safe ● Lightweight, can run many of them in one thread, ● Easy to switch between threads ● Platform independent ● Easy to debug and detect errors. Fri. Oct 21 2022
- 27. Fri. Oct 212022
- 28. Don’t Miss My Workshop 6:00PM today Fri. Oct 21 2022
- 29. About Me Follow Me @AhmedNMahran Thanks! Youtube (containsall my links) Fri. Oct 21 2022
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