Almost all projects here use Java + Spring Boot, and I'll have 30 min to show why teams should start trying Kotlin out

If you already have project in Java, why not use Kotlin on already existing projects? show how to test for legacy java code using kotlin tests. then when you have non-regression tests, show the "java 2 kotlin converter" and refactor and show that you can switch slowly from java to kotlin, just the new classes, without risks nor regressions

How would i print out

hashCode()

of my class from an interface that this class implements?

Sounds weird, but how do you put lazy in lazy? simple smile

val foo by lazy {
        val bar by lazy {  }.value
    }

??

What do you want this to do?

Starting with Kotlin 1.4, we don't have to include

stdlib

dependency anymore, it's included by default. Does it detect automatically what Java version I'm targeting ? So if I target

Java 1.8

, will it download

kotlin-stdlib-jdk8

? Same for

Java 1.7

?

Friendly heads up to the community. CodeCov got popped. A malicious actor has been in control of the bash script used to upload code coverage reports to their servers for the past 2 months. IE. Malicious arbitrary code execution in the CI/CD pipelines for their users. This is a fairly popular tool used in CI/CD pipelines for generating code coverage reports on GitHub. 😬 https://about.codecov.io/security-update/

https://twitter.com/kotlin/status/1382716606837624851 Did you know that you can significantly improve the compilation time of your projects with Kotlin/Native targets, for example #KMM projects? 🚀 The Kotlin team has prepared a special page with tips on how to do it! 🤩 Check it out: ➡️ https://t.co/O29FlkEjQI https://t.co/xy0C6tc4Tc Twitter

https://twitter.com/kotlin/status/1383472834131857409 Want to spend some free time with Kotlin? Check out our YouTube channel! 🦁 Standard Library Safari 🍃 Spring Time 🚀 Multiplatform Multiverse 🎙️ Talking Kotlin Podcast 👩‍🏫 Expert Webinars Subscribe and hit 🔔 for notifications! https://t.co/lqgbEhzqPK Twitter

https://twitter.com/kotlin/status/1383765004751499283 Check out our new teaser​ for the Talking Kotlin podcast, which hints at the return of the weather section, the mortal sin we have committed, and Sebastian giving some life advice you can look forward to, and much more... Subscribe not to miss it! ✅ https://t.co/QwDaZOV2cU Twitter

Why this is not allowed?

public typealias SetValue<Value> = Value

"Type alias expands to Value, which is not a class, an interface, or an object"

Where can I get

kotlin-preloader.jar

as mvn attifact? It comes with a compiler in the github release, but I couldn't find it on mavencentral.

https://twitter.com/kotlin/status/1384146018355191827 Experience all the benefits of Kotlin's interoperability: use any of your favorite Java frameworks and libraries to smoothly create server-side apps with Kotlin. Learn more ⬇️ https://t.co/1MkyXTGJnh Twitter

https://twitter.com/kotlin/status/1384206172941479939 👩‍🏫 👨‍🏫 On Apr 21, we are hosting a webinar with @noraltavir, a physicist-programmer, researcher, and lecturer at @mipt_eng! Alexander will share his experience of teaching a science-targeted Kotlin course for almost three years. Set your reminders! 🔔 https://t.co/e3nET8AWMS Twitter

Are there any simple user permission model sample/lib write in Kotlin? For example, allow A user can edit article but B user can only view. There is a SQL sample https://dev.to/dillonsadofsky/a-simple-user-permission-system-for-sophisticated-systems-2lan

Realm Kotlin Multiplatform SDK Nabil Hachica, Android Engineer, from MongoDB Realm shares their story of creating a pure Kotlin-first SDK for use by developers. Realm is an open-source, easy-to-use local database that helps mobile developers to build better apps faster. It launched 8 years ago with the release of the Realm Java SDK, and since then we’ve worked to […]

https://twitter.com/kotlin/status/1384481981690433536 Check out the story of Realm's Kotlin Multiplatform SDK! Learn what motivated their Engineering team’s decision to build a new SDK and the key design principles that guided their development. https://t.co/EnKFGoqVLj Twitter

https://twitter.com/kotlin/status/1384554414145515526 With the release of Kotlin 1.5.0 around the corner, we’re offering a detailed look at the new language features! Watch the first video in a series of 4! It covers new functionality for sealed interfaces and other improvements. Subscribe and stay tuned! https://t.co/oiyuJe8mTh Twitter

When the response wasn't generic, it worked nicely though...

https://twitter.com/kotlin/status/1384900249630740482 Check out this article from @rafa_piki on how to build a backend, an API, and a web client using Ktor 👀 Read it now ⬇️ https://t.co/RGyRGHjwfw Twitter

Is it possible to remove the nullability of a generic type? Sort of the opposite of

T?

. ie. here I invented the

!!

type operator for it. Should be clear from the example here why it makes sense.

interface LoadingCache<K : Any, V> {
    fun get(key: K): V // <-- If it can return null then it must be specified by type V

    // If load returns null then entries are missing hence it doesnt make sense to have here : Map<K,V?>
    fun <MV : V!!> getAll(keys: Iterable<K>): Map<K, MV> {
        return keys.mapNotNull { k -> get(k)?.let { k to it } }.toMap()
    }
}

https://twitter.com/kotlin/status/1385256334183043082 Our second video about the language features of the upcoming Kotlin 1.5.0 release is out! In this episode, @sveta_isakova discusses the support for JVM Records in Kotlin 1.5.0 More videos are coming soon! Subscribe if you don’t want to miss a thing! https://t.co/tHk6FkywzL Twitter

Do you remember your first introduction to Kotlin? New Users Survey The “Kotlin New Users Survey” will help us understand the ways people are introduced to Kotlin, and what is important to them during the first steps of their journey. We want the experience in the early stages to be a good one for the adopters. Getting feedback from the community is useful for us to […]

Hello

I'm trying to install ktor on intelij but I get Required plugin 'com.intelij.microservices.uast' to be installed. I don't know where to get the microservices plugin.

I cannot seem to get the ide/gradle to detect my script file templates so I cannot set up a custom scripting environment in my code base. Is there anyone who is a little experienced and can help me do the absolute bare minimum to get a scripting environment set up?

https://twitter.com/kotlin/status/1385576080556318720 Do you remember how you were first introduced to Kotlin? 🚀 Please tell us about it! If you’ve just started learning Kotlin or if you remember what it was like, you could really help us out by completing this survey 👉 https://t.co/S7YBFoULxW 👈 https://t.co/Fvh06NL3mL Twitter

Is there a way to make nested declaration (inside class) file private (instead of class private)? I feel like

private

modifier meaning is dependant on context...

https://twitter.com/kotlin/status/1385972803019624451 Check out the third video in our series dedicated to the language features of Kotlin 1.5.0 to learn about inline value classes. This feature was experimental for some time, and Kotlin 1.5.0 stabilizes it and makes some changes. https://t.co/NZQccxQeP4 Twitter