The document provides an overview of Kotlin, highlighting its introduction by JetBrain in 2011, its compatibility with Java, and its subsequent support from Google for Android development. Key features are emphasized, including null safety, data classes, extension functions, and higher-order functions, along with capabilities for cross-platform development. The presentation is geared toward educating readers on the advantages and functionalities of using Kotlin in various programming environments.

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Kotlin
Understand the Magic

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• Sr. Android Engineer at Wizeline
• Android Mobile Team lead
• 8 year of Experiences in Java and Android
HIEN NGO
HCMC, VN
WIZELINE

3. About Kotlin
Understand Kotlin top feature
Kotlin Puzzlers
QA
Kotlin
Understand the Magic

4. SLIDE
4
About Kotlin
● Jul 2011, introduced by JetBrain
● Feb 2016, Kotlin 1.0 released
● Google I/O 2017, Google officially support Kotlin on Android

5. SLIDE
5Most Loved Languages Most Wanted Languages
Source: StackOverFlow 2017 Insight

6. SLIDE
6
Source: Realm Report

7. SLIDE
7
About Kotlin
● OOP Programming Language
● Fully Java compatible
● Functional Programming Style
● Basics, Smart, Safety, Minimal, Flexibility

8. SLIDE
8
About Kotlin
● Multiplatforms with Kotlin
○ Server: Kotlin/JVM, Ktor https://ktor.io/
○ Web page: Kotlin/JS
https://github.com/jetbrains/create-react-kotlin-app
○ Android: Kotlin/JVM
○ iOS: Kotlin/Native
https://github.com/JetBrains/kotlin-native/tree/master/samples
● Sample App: https://github.com/JetBrains/kotlinconf-app

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Beautiful Future or False Promises

11. Null Safety

12. Null Safety
- Nullable types and Non-Null Types
Eg: String - String? , View - View?
var greeting: String = "Hello, World"
greeting = null // Compilation Error
var nullableGreeting: String? = "Hello, World"
nullableGreeting = null // Allowed
- Safe call operator: ?.
var length = nullableGreeting?.length()
- Elvis operator: ?:
var currentCompany = user?.profile?.company ?: "Wizeline"
- Not null assertion : !! Operator
var length = nullableGreeting!!.length()

13. Null Safety

14. Null Safety

15. Null Safety

16. Null Safety

17. Null Safety

18. Null Safety

19. Data Class

20. Data Class
-

21. Data Class

22. Data Class

23. Extension
Function
Extend a class with new functionality
without having to inherit from the class or
use any type of design pattern such as
Decorator

24. Extension
Function

25. Extension
Function

26. Extension
Function

27. Higher Order
Functions
A function that takes functions as
parameters (callbacks), or returns a
function

28. Higher Order
Functions

29. Higher Order
Functions

30. Higher Order
Functions

31. Higher Order
Functions

32. Higher Order
Functions

33. Higher Order
Functions

34. DSL
A domain-specific language (DSL) is a computer language
specialized to a particular application domain. This is in contrast
to a general-purpose language (GPL), which is broadly applicable
across domains.

35. DSL
Source: Anko Library For Android

36. DSL

37. DSL

38. DSL

39. SLIDE
39
Many More….
- Coroutines
- Type Check and Smart Casts
- Collection Processing
- Depreciation Handler
- Any, Nothing and Unit
- Delegation
....

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