The document is a presentation on Kotlin for Android, prepared by Shady Selim, highlighting its benefits, history, and strengths. It discusses Kotlin as a statically typed programming language designed for the JVM, featuring concise syntax, null safety, and seamless Java interoperability. The presentation includes resources and examples to support developers interested in transitioning to or adopting Kotlin.

1. Kotlin for Android
Prepared by Shady Selim
@Kotlin.Cairo #Kotlin @Helwan.GDG #GDG_Helwan
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2. Speaker Bio
• Official Google Speaker
• GDG Helwan Founder & Leader
• Kotlin Cairo User Group Founder
• Mentor in Udacity Nanodegree
• Mobile & Web Evangelist
• Technology savvy
• Think tank
• UI/UX freak
www.linkedin.com/in/shadyselim/
@dr_Shady_Selim
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3. Who created Kotlin?
• IntelliJ IDEA
• PhpStorm
• ReSharper
• PyCharm
• RubyMine
• … others
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4. What is Kotlin?
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5. Why Kotlin Now?
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6. 6
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7. Is Kotlin Really new?
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8. Why Should I care!!?
• Statically typed programming language targeting the JVM
• Support for functional and OO paradigms
• Pragmatic, safe, concise, great Java interop
• Free and open-source
• Drastically reduce the amount of boilerplate code
• Lambda expression
• Avoid entire classes of errors such as null pointer exceptions
• Java 9 is …
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9. The Strengths of Kotlin
• Modeling the data of your application concisely and expressively
• Creating reusable abstractions using functional programming
techniques
• Creating expressive domain-specific languages (DSL)
• Java interop ensures that all existing Java frameworks can be used
• No rewrite required to start using Kotlin in existing codebase
• Existing investment is fully preserved
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10. Java Model Example
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11. Java Model Example, cont.
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12. Java Model Example, cont.
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13. Kotlin Model Example, cont.
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14. The Strength Points
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• In addition to all what was mentioned
• Extensions
• Anko (Commons, Layouts, SQLite, & Coroutines)
• No new
• No semi colon
• Smart casting
• Great IDE and tooling supports
• Variables (val vs. var)
• functions

15. Do you like reactive programming?
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16. Missing your frameworks or libraries!?
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17. Missing your frameworks or libraries!?
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18. Missing your frameworks or libraries!?
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19. Missing your frameworks or libraries!?
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20. kotlin.link
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21. Resources
• https://kotlinlang.org/
• https://m.signalvnoise.com/kotlin-its-the-little-things-8c0f501bc6ea
• https://www.jetbrains.com/
• https://www.slideshare.net/intelliyole/kotlin-why-do-you-care
• https://github.com/ReactiveX/RxKotlin
• https://spring.io/blog/2016/02/15/developing-spring-boot-applications-
with-kotlin
• https://www.slideshare.net/makingx/spring-kotlin
• https://kotlin.link/
• http://www.overrideandroid.info/2017/04/kotlin-do-more-with-less-
code.html
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22. Questions!?
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