Dave Leeds

Return... in Expression Bodies?! YouTube video by Dave Leeds

This #Kotlin update was easy to miss! You can now use `return` in expression bodies. On the surface, it sounds useless, but I put together this 6-minute video to show the reasons why it's actually an important update.

www.youtube.com/watch?v=Y8hu...

#AndroidDev

Thanks so much to @kotlinweekly.bsky.social for including my video about Kotlin 2.3's Explicit Backing Fields in this week's issue! If you're a #Kotlin developer, go follow them for weekly updates with all the latest Kotlin news.

Have you seen the Explicit Backing Fields feature in #Kotlin 2.3? I cover what you need to know about them in this week's video. Add to your calendar 👇

Google Calendar: typea.li/as/d8jvsz3
Download invite: typea.li/as/ybv8kcj
"Notify" on YouTube: typea.li/as/yt2602

Premieres Wed at 10 AM CST.

How to Prevent Race Conditions in Kotlin Coroutines YouTube video by Dave Leeds

Concurrency + Mutable State = Risk

Kotlin's design of coroutines prevents a lot of problems, but not race conditions. It does give us some great tools to help, though! Here's a 9-minute video that covers what you need to know about each one. I hope you find it helpful!

👉 youtu.be/Ap-cVIM5ORY

Firebender - TypeAlias Show #8 We're kicking off the fall season with special guest Kevin Tang, who's going to show us what Firebender can do. In this episode, we will: - Check out some of the latest roadmap updates for Kotlin. - ...

I can't wait to start up the livestreams again! We're kicking off the fall season this Wednesday at 10 AM CDT with special guest Kevin Tang, who's going to show us what Firebender can do!

typea.li/as/live08

Add to your calendar:
Google - typea.li/as/vvcxd6l
Download Invite - typea.li/as/8lxgxw2

Putting Kotlin Flows Together YouTube video by Dave Leeds

Need to put those #Kotlin flows together? The merge(), combine(), and zip() functions are available, and each one works a little differently - I break them down for you in this video.

youtu.be/Jmwr9vcmWWs

Wow, that's a lot of growth in one year! 🎉

What's New in IntelliJ IDEA Explore IntelliJ IDEA's latest features and updates to elevate your professional Java and Kotlin development experience.

It's been a few years since I've worked on a Spring service, but the new Spring Debugger plugin in the latest @intellijidea.com looks really cool! Stuff like...

- Loaded vs unloaded beans
- Active vs inactive configs
- Debug beans at use site

More about 2025.2: www.jetbrains.com/idea/whatsnew/

Hey, Valère! Thanks for asking! My video editing is done in Davinci Resolve. Some of the annotations (basic lines and circles) are just my own hand-drawn annotations, but the ones that zoom in like that are plugins from MotionVFX. I believe the one in your screen grab is from mHowTo.

Registration | KotlinConf 2026, May 20–22, Munich KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.

🎟️ Super Early Bird tickets for KotlinConf 2026 are live!

🗺️ We’re heading to Munich, Germany – a brand-new venue in the heart of Europe.

Secure your spot now 👉 kotl.in/conf26-tickets

📨 Want exclusive KotlinConf news before everyone else?

Newsletter subscribers get early access to the Super Early Bird and Early Bird ticket launches, key dates, and more.

Subscribe to the KotlinConf newsletter 👉 kotlinconf.com/subscription/

Yeah!! We got to be partners for #KotlinConf this year! 🎉

Yeah! I thought it was funny that this photo made a brief appearance in your presentation when you clicked over to the notifications page. 😅

Building a Bluesky Bot powered by AI at #KotlinConf, by @raphaeldelio.dev

Ah, there ya go, that would do it! 😄

I'm not on my usual Windows machine here, but on Mac I get the println() output regardless of the dispatcher I choose.

Thanks for looking into it! For what it's worth, I'm using Windows here, and Ctrl+C copies just the selection for me.

What can we do with Kotlin Notebooks? - TypeAlias Show #7 Google I/O and KotlinConf are just around the corner! Let's get one more livestream in before then! - We'll check out the latest news happening in the Kotlin and Android worlds. - We'll look over som...

You can add it to your calendar here:

Google Calendar - typea.li/as/by6y4dm
Outlook Web - typea.li/as/9zckxmx
Download Invite - typea.li/as/9m7snbs

What can we do with Kotlin Notebooks? - TypeAlias Show #7 Google I/O and KotlinConf are just around the corner! Let's get one more livestream in before then! - We'll check out the latest news happening in the Kotlin and Android worlds. - We'll look over som...

So many exciting announcements in the #Kotlin and #AndroidDev worlds, even ahead of KotlinConf and Google I/O! Let's dig into them during this week's livestream. Plus, we'll check out lots of cool things we can do with Kotlin Notebooks. Wednesday 10 AM CDT. typea.li/as/live07

Double Dispatch: Prelude to the Visitor Pattern YouTube video by Dave Leeds

Double dispatch - let's see what it is, how it's traditionally handled in single-dispatch languages, and how we can get a similar effect in #Kotlin. www.youtube.com/watch?v=4cUQ...

This Wednesday's #Kotlin video is about Double Dispatch - gotta understand it before we get to the Visitor Pattern!

Premieres this Wednesday:
typea.li/as/x9lrbng

Add it to your calendar here:
Google - typea.li/as/gy9sbvv
Outlook Web - typea.li/as/njypjzr
Download Invite - typea.li/as/gl5l7c8

#Kotlin Notebooks - Now included in IntelliJ IDEA Community Edition! 🎉https://blog.jetbrains.com/idea/2025/04/kotlin-notebook-arrives-in-intellij-idea/

Junie, the coding agent by JetBrains Delegate your tasks, focus on the results

JetBrains' Junie AI coding agent has been promoted to general availability. No need to hang out on a waitlist any more! www.jetbrains.com/junie/

Thanks so much, Maxime! I hope you enjoy it!

Kotlin: An Illustrated Guide Kotlin: An Illustrated Guide [Leeds, Dave] on Amazon.com. *FREE* shipping on qualifying offers. Kotlin: An Illustrated Guide

Hey, it's a big day! After over 5 years of writing, illustrating, and updating, Kotlin: An Illustrated Guide is finally available in paperback!

amazon.com/Kotlin-Illus...

Thanks so much to all of you in the #Kotlin community for all the encouragement every step along the way! 🎉

Kotlin 2.1.20 - Atomics, UUIDs, and more! - TypeAlias Show #6 YouTube video by Dave Leeds

What's new in Kotlin 2.1.20? During this Wednesday's livestream, we'll take a look at the new atomic types, some UUID updates, datetime changes, and lots more!

typea.li/as/live06

Google Calendar - typea.li/as/4xrb3gm
Outlook Web - typea.li/as/zjdkbjs
Download Invite - typea.li/as/chnz9lp

Of Variables, Expressions, and the Nature of Types So thou seekest to be a Kotlin craftsman? Thou hast come unto the right place! Thy journey beginneth here in Chapter the First, wherein thou shalt learn of variables, expressions, and types.

For those who grew up in Jacobean England, reading modern English can be confusing with its shorter sentences and less eloquent phrasing. So today I'm releasing the first chapter of #Kotlin: An Illustrated Guide in Shakespearean English!

typealias.com/fun/illustra...

Applying the Observer Pattern in Kotlin - premieres Wednesday at 10 AM CDT. See you there!

Add it to your calendar here:

Google: typea.li/as/ymrwvyl
Outlook: typea.li/as/wyj55gw
Download Invite: typea.li/as/spxr9mc

Or just hit the "Notify Me" button on YouTube:
typea.li/as/wt5rcg9

Me, holding the first paperback proof of my book, Kotlin: An Illustrated Guide.

Hey! The first proof of the paperback edition of Kotlin: An Illustrated Guide is in hand! After about 5 years of working on this book online and in PDF, it's an amazing feeling to finally experience it in print.

Can Junie generate Kotlin code from UML? YouTube video by Dave Leeds

Can Junie generate Kotlin code from UML better than traditional UML code generators? Let's see if it can implement functions and properties based on context, notes, and other clues!

www.youtube.com/watch?v=J_DF...