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@bennegeek Lessons Learned from Using Kotlin Multiplatform internally JB Lorenzo | #DCNYC19

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@bennegeek Re-org

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@bennegeek Re-org

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@bennegeek Poznan Berlin Shared Services

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@bennegeek Poznan Berlin Shared Services

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@bennegeek Poznan Berlin

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@bennegeek Poznan Berlin

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@bennegeek Poznan Berlin

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@bennegeek Poznan Berlin Pack 1 Pack 2 Pack 3 Pack 4 Pack 5 Pack 6 Pack 7 Pack 8

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@bennegeek Poznan Berlin Pack 1 Pack 2 Pack 3 Pack 4 Pack 5 Pack 6 Pack 7 Pack 8 Why?

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@bennegeek Poznan Berlin Pack 1 Pack 2 Pack 3 Pack 4 Pack 5 Pack 6 Pack 7 Pack 8 Why? Why? Why?

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@bennegeek Poznan Berlin Pack 1 Pack 2 Pack 3 Pack 4 Pack 5 Pack 6 Pack 7 Pack 8 Why? Why? Why? Why? Why? Why?

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@bennegeek old API

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@bennegeek old API new API

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@bennegeek old API new API

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@bennegeek Poznan Berlin Pack 1 Pack 2 Pack 3 Pack 4 Pack 5 Pack 6 Pack 7 Pack 8 Why? Why? Why? Why? Why? Why?

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@bennegeek Time

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@bennegeek Time

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@bennegeek Kotlin/ MPP Time

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@bennegeek Kotlin/ MPP Time Time/ Effort Saved

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@bennegeek Haaaave you met…

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@bennegeek Kotlin/MPP Haaaave you met…

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@bennegeek

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@bennegeek

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@bennegeek Resistance Uncertainty Concerns Risk

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@bennegeek Resistance Uncertainty Concerns Risk

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@bennegeek New Concepts Existing Concept Resistance Uncertainty Concerns Risk

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@bennegeek Resistance Uncertainty Concerns Risk Kotlin/MPP

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@bennegeek Resistance Uncertainty Concerns Risk Kotlin/MPP On going (Internally only) In Production

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@bennegeek Kotlin/MPP

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@bennegeek Android First

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@bennegeek Android First app implementation project(":features:posting") implementation project(":features:posting_ui")

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@bennegeek Android First

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@bennegeek Android First Kotlin Serialization Time Ktor Onboard Android Devs

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@bennegeek Android First Kotlin Serialization Time Ktor Onboard Android Devs SQLDelight View Models and the rest

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@bennegeek iOS

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@bennegeek iOS * No control over Kotlin code * No knowledge of Kotlin/Kotlinx * Can we run tests * Is this a transition to Kotlin * Ktor Multiplatform is "experimental" * Concerns about coupling and syncing

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@bennegeek iOS * No control over Kotlin code * No knowledge of Kotlin/Kotlinx * Can we run tests * Is this a transition to Kotlin * Ktor Multiplatform is "experimental" * Concerns about coupling and syncing Write a detailed RFC

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@bennegeek iOS * Are there bigger projects? * Concerns about learning curve * Still No control on Kotlin code * Fear of bugs * Debugging * Performance concerns

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@bennegeek iOS * Are there bigger projects? * Concerns about learning curve * Still No control on Kotlin code * Fear of bugs * Debugging * Performance concerns Limit Scope of RFC Gather support from Android devs

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@bennegeek iOS * Scope is too small * Concerns about interop not being smooth * Concerns about memory, thread, error management

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@bennegeek iOS Both iOS/Android developers Android developer

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@bennegeek iOS Both iOS/Android developers Android developer Continue with MPP on Android Use only internally for iOS

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@bennegeek iOS Swift/Objc iOS App

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@bennegeek Models Model to Domain Mappers Interfaces Network Calls (Ktor) iOS Kotlin/MPP Swift/Objc iOS App

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@bennegeek Models Model to Domain Mappers Interfaces Network Calls (Ktor) iOS Kotlin/MPP Swift/Objc iOS App

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@bennegeek iOS Swift/Objc iOS App Models Model to Domain Mappers Interfaces Network Calls (Ktor) Kotlin/MPP Model to I Netwo Sw

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@bennegeek iOS Swift/Objc iOS App Models Model to Domain Mappers Interfaces Network Calls (Ktor) Kotlin/MPP Model to I Netwo Sw

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@bennegeek iOS Models Model to Domain Mappers Interfaces Network Calls (Ktor) Kotlin/MPP Models Model to Domain Mappers Interfaces Network Calls (Ktor) Swift

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@bennegeek iOS Swift/Objc iOS App Models Model-to-Domain Mappers Interfaces Network Calls (Ktor) Swift

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@bennegeek Team Learnings

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@bennegeek Technical Learnings

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@bennegeek Technical Learnings Mapping Strings to Enum using Kotlin Serialization

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@bennegeek Technical Learnings Mapping Strings to Enum using Kotlin Serialization

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@bennegeek Technical Learnings Mapping Strings to Enum using Kotlin Serialization

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@bennegeek Technical Learnings Threading issues on the Main Thread https://blog.usejournal.com/the-dos-and-donts-of-mobile-development-with-kotlin-multiplatform- db7c098545c0 https://medium.com/@yuyaHorita/kotlin-native-ios-a1a73d7390fe https://proandroiddev.com/current-issues-with-kotlin-multiplatform-and-how-to-fix-them-5ae62822a546

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@bennegeek Technical Learnings Error Handling @Throws fun kotlinMethod()

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@bennegeek Technical Learnings Error Handling @Throws fun kotlinMethod(str: String) - (void)kotlinMethod:(NSString *)str error:(NSError * _Nullable * _Nullable)error;

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@bennegeek Technical Learnings Error Handling @Throws fun kotlinMethod(str: String) func kotlinMethod(str: String) throws

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@bennegeek Technical Learnings Project is not mono-repo, how to include Kotlin/MPP

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@bennegeek Technical Learnings Project is not mono-repo, how to include Kotlin/MPP

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@bennegeek Technical Learnings Output is only 64-bit?

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@bennegeek Technical Learnings Output is only 64-bit?

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@bennegeek Technical Learnings Where are my dragons debugging symbols

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@bennegeek Technical Learnings Where are my dragons debugging symbols https://github.com/JetBrains/kotlin-native/issues/2422 * dSYM files only for debug

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@bennegeek Technical Learnings Coroutines on iOS?

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@bennegeek Technical Learnings Coroutines on iOS? // common internal expect val ApplicationScope: CoroutineScope ApplicationScope.launch { try { val ret = getCitySuggestion(query, isAdding, longitude, latitude) callback(ret, null) } catch (error: Error) { callback(null, error) } }

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@bennegeek Technical Learnings Coroutines on iOS? // ios/actual.kt internal actual val ApplicationScope: CoroutineScope = MainScope() private class MainDispatcher: CoroutineDispatcher() { override fun dispatch(context: CoroutineContext, block: Runnable) { dispatch_async(dispatch_get_main_queue()) { block.run() } } } internal class MainScope: CoroutineScope { private val dispatcher = MainDispatcher() private val job = Job() override val coroutineContext: CoroutineContext get() = dispatcher + job }

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@bennegeek What’s next for us * do Workshops for MPP * Pair iOS and Android devs * Wait for large companies to adopt Kotlin /MPP

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@bennegeek What you can do * Introduce Kotlin/MPP * Make an RFC in your team * Make devs familiar with both iOS and Android * Pair iOS and Android devs * Make your efforts public * Help Improve tooling Kotlin /MPP

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@bennegeek tech.olx.com

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Berlin Buenos Aires Lisbon New Delhi Poznan Dubai

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@bennegeek Thank you! Any Questions? Get in touch with us olxgroup.com tech.olx.com olxtechberlin [email protected] jblorenzo JB Lorenzo | #DCNYC19