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About speaker Hello! I’m Toan Kotlin GDE, Android folk @Lazada https://toan.mobi toantran-ea toan_mobi 

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 ) 

What is Kotlin The Kotlin language project started in 2010 and soon went open-source 

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 

GDG Location Why Kotlin? Expressiveness Safety Interoperability Structured concurrency 

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? 

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? 

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? 

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? 

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? 

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? 

The major usage of Kotlin right now 

In my “ideal world” Cross-functional team model 

How Kotlin Multiple Platform could help? 1. JVM Code 2. JS Code 3. Native Code 4. Common Kotlin 

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. 

Platform specific version of Kotlin 1. Kotlin/JVM, Kotlin/JS, Kotlin/Native: Platform specific libs and tools. 

Structure of shared code 

Structure of shared code 

Structure of shared code 

Code demo - Project 1 

Code demo - Project 2 

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 

Key takeaways 3. Where to start? with sample a. Mobile KMP: Kotlin Conf app b. JS/JVM: [email protected]:kotlin-hands-on/jvm-js-fullstack.git c. Another one: [email protected]:Kotlin/kotlin-full-stack-application-demo.git 4. Start with step-by-step guide: here 

Thank you