Kotlin for fullstack web/apps development

This talk covers the idea of having Kotlin to support in building multiple-component applications. With Kotlin's help, your Backend, Frontend, and Mobile all written in the same language, shares the same business model and domain objects, re-used the business rules and validations.
The talk also comes up with a sample code demonstration to understand how this could be realized.

Transcript

2. About speaker Hello! I’m Toan Kotlin GDE, Android folk @Lazada https://toan.mobi toantran-ea toan_mobi
3. Kotlin for fullstack web/apps development 1. What is Kotlin? (2 mins ) 2. Why Kotlin? (5 mins ) 3. Kotlin multiple platform to power us (10 mins ) 4. Deep-dive into code to understand KMP (15 mins ) 5. Key-takeaways. (3 mins )
4. What is Kotlin The Kotlin language project started in 2010 and soon went open-source
5. Kotlin evolution v1.0: stable release v1.1: coroutines (experimental ) v1.2: Kotlin multiple platforms/Kotlin native (experimental) v1.3: coroutine (stable ) v1.4: Performance improvement
6. GDG Location Why Kotlin? Expressiveness Safety Interoperability Structured concurrency
7. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Why Kotlin?
8. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Nullability in the type system Why Kotlin?
9. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Nullability in the type system Lambdas Why Kotlin?
10. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Nullability in the type system Lambdas Extension functions Why Kotlin?
11. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Nullability in the type system Lambdas Template expressions Extension functions Why Kotlin?
12. class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } Nullability in the type system Lambdas Template expressions Extension functions Property access syntax for getters and setters Why Kotlin?
13. The major usage of Kotlin right now
14. In my “ideal world” Cross-functional team model
15. How Kotlin Multiple Platform could help? 1. JVM Code 2. JS Code 3. Native Code 4. Common Kotlin
16. KMP - Common Kotlin 1. The language, core libs, basic tools to serve all the platform. 2. Rely on daily-task support tools like Http, serialization, and managing coroutines.
17. Platform specific version of Kotlin 1. Kotlin/JVM, Kotlin/JS, Kotlin/Native: Platform specific libs and tools.
18. Structure of shared code
19. Structure of shared code
20. Structure of shared code
21. Code demo - Project 1
22. Code demo - Project 2
23. Key takeaways 1. Production ready? yes! (KotlinConf 2019: Kotlin in Space by Maxim Mazin) 2. Not everything can be shared a. To share: Data, View Model, Validations, Utils, View Model, RPC, Common Libs b. Not to share: UI, Data storage
24. Key takeaways 3. Where to start? with sample a. Mobile KMP: Kotlin Conf app b. JS/JVM: git@github.com:kotlin-hands-on/jvm-js-fullstack.git c. Another one: git@github.com:Kotlin/kotlin-full-stack-application-demo.git 4. Start with step-by-step guide: here
25. Thank you