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What's New In Kotlin at Google IO 2019 - Summary
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Miguel Beltran
May 29, 2019
Programming
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130
What's New In Kotlin at Google IO 2019 - Summary
Everything that was presented as new in Kotlin at Google IO in 5 minutes
Miguel Beltran
May 29, 2019
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Transcript
What’s New in Kotlin Google I/O 2019
Back To The Future: 2017 2017 Keynote → Google announces
official Kotlin support Creation of Foundation: - Lead Language Designer - Control breaking changes via Language Committee
State Of Kotlin 2019 ➔ Preferred language by Google for
Android dev ➔ Best support in Jetpack libraries ◆ KTX, Jetpack Compose, etc. ➔ Used at Google ◆ Drive, Nest, Home, system UI, etc. ➔ Koltin/Native → Now Beta! ➔ Coroutines everywhere
Capturing ‘when’ val response = getResponse() when (response) { OK
-> process(response) CANCELED -> print("canceled") }
Capturing ‘when’ when (val response = getResponse()) { OK ->
process(response) CANCELED -> print("canceled") }
Experimental Annotation @Experimental(level = WARNING) annotation class NewAPI @NewAPI class
MyService val service = MyService()
Contracts fun MyClass?.notNull(): Boolean { contract { returns(true) implies(this@notNull !=
null) } return this != null }
Serializable Annotation @Serializable data class Customer( val id: Int, val
name: String ) Json.stringify(Customer.serializer(), customer)
Flow → Asynchronous cold streams, in preview! val values: Flow<Int>
= flow { delay(1000) emit(42) } values.collect { value -> println("Received $value") }
More Language Features! ➔ Unsigned Ints ➔ Better parallel builds
with Gradle ➔ Incremental Annotation Processor with KAPT ➔ New Type Inference Engine (helps with Rx!) ➔ Progressive Mode (more experimental features)
Better Community Support ➔ Code Samples in Kotlin ➔ New
Online Training w/ Udacity
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