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Wondering in Kotlin Multiverse Wajahat Karim Google Developer Expert in Android wajahatkarim.com

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This is Wajahat Karim! - Google Developer Expert in Android - Over 8 years experience in Android - Open Source Contributor - Technical Blogs & Books Writer - Love to share my knowledge with others Follow me on Twitter @WajahatKarim Visit my website: wajahatkarim.com

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life begins at the end of your COMFORT ZONE -Neale Donald Walsch-

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Modern Language

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2016 2017 2018 2019 2020 2022 Kotlin Timeline

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2016 2017 2018 2019 2020 2022 1.0 Kotlin Timeline

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2016 2017 2018 2019 2020 2022 1.0 Google I/O: Kotlin Officially supported language for Android Kotlin Timeline

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2016 2017 2018 2019 2020 2022 1.0 Google I/O: Kotlin Officially supported language for Android Google I/O: Android goes Kotlin-first Kotlin Timeline

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2016 2017 2018 2019 2020 2022 1.0 Google I/O: Kotlin Officially supported language for Android Google I/O: Android goes Kotlin-first Coroutines Preferred Kotlin Timeline

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Kotlin Timeline 2016 2017 2018 2019 2020 2022 1.0 Google I/O: Kotlin Officially supported language for Android Google I/O: Android goes Kotlin-first You are here Coroutines Preferred

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WHY KOTLIN?

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Expressiveness Safety Interoperability Structured concurrency

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- Google Preferred Language - Statistically typed - Type Inference - Developed by Jetbrains - Concise - 100% interoperable with Java - Null Safety - And many more.

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Java vs Kotlin

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Java to Kotlin

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Tools For Kotlin.

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class MainActivity : AppCompatActivity () { override fun onCreate(savedInstanceState: Bundle?) { ... fab.setOnClickListener { view -> Snackbar.make(view, "Hello ${name.capitalize()}", Snackbar.LENGTH_LONG).show() } fab.backgroundTintList = backgroundTintList } } A Wide Kotlin Example

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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 A Wide Kotlin Example

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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 A Wide Kotlin Example

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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 A Wide Kotlin Example

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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 A Wide Kotlin Example

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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 A Wide Kotlin Example

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● Data Classes ● Extension Methods ● Elvis Operator ● Properties ● Default Parameters ● Type Aliases ● Named Parameters ● Spread Operator ● Auto Casts ● Covariance ● Null Safety ● Operator Overloading ● Type Inference ● DSL Support ● Type-Safe Builders ● Coroutines ● String Interpolation ● Ranges ● Map Array Syntax ● Inline Functions ● Sealed Classes ● Delegation ● Destructuring ● KDoc

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But wait….

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• Advantages over Java 7 are overwhelming • Java 8 introduced • Lambdas • Null safety (“Optional” class) • Default methods • Streams API • New Date & Time API Java strikes back with Java 8

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• Is more elegant, concise and safe • Has more cool stuff But even with Java 8 Kotlin still...

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Resources • https://kotlinlang.org/ • https://play.kotlinlang.org/ • https://developer.android.com/courses/fundamentals-training/toc-v2

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Thank you for listening... @WajahatKarim wajahatkarim.com youtube.com/c/wajahatkarim3