Taming the Kotlin Compiler

John Rodriguez

Android Developer

Cash App

John is an Android engineer on Cash App. Contributor to Square and Cash App Open Source. Previously at Amplify and Major League Baseball.

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Abstract

As more and more Android code is being written in Kotlin, and many developers are switching over from Java, the performance of the Kotlin compiler has become a hot discussion topic. Javac has been tuned and optimized for many years, so how does kotlinc compare?

In addition, there are a whole new family of tools around kotlinc, such as kapt, the Kotin Gradle plugin and more. How can one use them efficiently to get optimal performance?

In this talk, we’ll take a deep dive into the following:

* Is Kotlin slower than Java? Should you worry?
* Caching and incrementality of Kotlin compilation
* How to use Kotlin with Gradle efficiently
* What is compilation avoidance and what are the state of things in Kotlin?
* Kotlin compilation in the context of Android

This talk will help you develop a better understanding of how your code is built, what performance bottlenecks exist in the toolchain, and how to avoid them to improve your build times.

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