Where should I keep these? Feels wrong to just stash them in the bookshelf with the other tech stuff. On the other hand, leaving them out on the coffee table feels a bit like bragging…

Once again grinning proudly with a book in my hand! This is my second book, Kotlin Brain Teasers. It was so much fun to unbox this and see the code puzzles on paper. I hope you enjoy solving them! More about the book here 👉 pragprog.com/titles/...

Just a reminder that if you enjoy a book, please leave a quick review on Amazon or Bookshop dot org, or wherever. Even if it's only a sentence, it really, really helps get the word out to other readers.

"The first tech book I could not put down. It is brilliantly structured, effortlessly engaging, and full of moments that make complex ideas click." Well, who am I to disagree? It's right there IN PRINT on the cover of my book! Don't just judge a book by its cover, though; buy it and make sure 😉

Why yes 🤔 what a very good book filled with practical coroutine advice 🧐💡 Still can't believe I'm holding a copy of my own book!

🔴🔵 If you follow this #Kotlin tip from Seb you can actually make your regular functions blue and your #async functions red, just like in Bob Nystrom's "What color is your function?" 😆 http://youtu.be/L-37...

This silly pyramid sketch is one of my favourite illustrations I drew for my book. So cool to see it in print, it looks even better! This is a page from the second chapter of Kotlin Coroutine Confidence 👉 pragprog.com/titles/...

I will also post this picture on its own because I feel like I (accidentally) let the box take centre stage in my other post. The box is cool and all, but I MADE A BOOK! I think that means I have to proudly celebrate my achievement and not hide behind a box. 👉 pragprog.com/titles/...

This is the face of a proud author 😊. Just opened up my very own print copies of Kotlin Coroutine Confidence! It feels great to hold it in my hand after all that time spent staring at a manuscript on a screen.

It's #FlashSale Weekend at pragprog.com#FlashSale 45% off* with code FlashSale *almost everything! During checkout, where to enter the code?

Channel: messages are shared out so that each message is received by exactly one consumer. Shared flow: messages are replicated so that each consumer receives its own copy of every message. #kotlin #coroutine tips 💡 The diagram is from 📚 Kotlin Coroutine Confidence 👉 pragprog.com/titles/...

More time to get money off my books! 📚

💡 #Kotlin #coroutine tip: a channel itself isn't a resource that needs closing. Its close() and cancel() functions are there to help you shut down the tasks/resources that are using or passing through the channel. Read more in Chapter 12 of Kotlin Coroutine Confidence 👉

It's not just my Kotlin books that are on sale right now—almost everything in the Pragmatic Bookshelf lineup is still 45% off until tomorrow! 👀 What tech skill will you learn next? Use code "flashsale" to grab your discount and start reading right now. 📚👉 https://pragprog.com/

Here's another table that I included in 📚 Kotlin Coroutine Confidence. A Flow in Kotlin is often described as an asynchronous stream, but I prefer to think of it as a suspending function that returns multiple values. What do you think? Is it more helpful to think of it as a stream or a function?

❤️🔁 Like or share if you know someone who'd like to save $ and learn a new tech skill! Almost everything in the Pragmatic Bookshelf lineup is 45% off right now when you use code "flashsale". There are some really unique titles—I'd love to hear which book you choose! 📚👉 https://pragprog.com/

📚⏱️ Been waiting for the perfect time to buy my books? It's NOW! For the next 48 hours only (September 18–20) you can use code "flashsale" to get 45% off all titles including Kotlin Coroutine Confidence and Kotlin Brain Teasers from The Pragmatic Bookshelf 😍👉 https://pragprog.com/

Just got a message from DHL that TWO shipments are coming from my publisher next week. Looks like I'll finally get my hands on some copies of my books!

48 hour FLASH! 45% off with code FLASHSALE @pragdave felt like stirring things up - he just put nearly every title on sale!

Pros and cons of blocked threads, callbacks, and suspending functions. Can you think of any others? Which ones are most important in your day to day code? This table's from Chapter 2 of my book, Kotlin Coroutine Confidence—find it here 👉 pragprog.com/titles/...

Good diagrams can really help new concepts to click, so I made sure to illustrate 📚 Kotlin Coroutine Confidence with a whole bunch of them! This one is from Chapter 12, "Share Flows, Connect Channels." Want the text to go with it? Look for the free PDF excerpt here 👉pragprog.com/titles/...

Tip to tell suspending functions and coroutines apart in Kotlin: 💡👉 Think of a suspending function as the script for a play, and a coroutine as the performance. 🎭 Every chapter in my book 📚 Kotlin Coroutine Confidence ends with a "Key Concepts" recap to help you remember what you've learned 👍

Thread-safe sets in Kotlin? I used to use Collections.newSetFromMap(ConcurrentHashMap()), but recently I learned that Java 8 actually added the even more succinct ConcurrentHashMap.newKeySet(). Which is great, but now what do I do in multiplatform Kotlin code that can't use Java? 🤔

When you read a book and love it and then take the time to post a review online, it means SO MUCH to the writers. Thank you.

I love programming

"Once upon a time, in a world vastly different than our own, a boy was born with antlers and horns and tail and more but that is beside the point his name was Paul. That's all." 😙👌 samwho.dev/story/?id=25...

Blown away by Guy Steele's 1998 talk on "Growing a Language". Every single word he speaks is chosen with thoughtfulness and intention—which turns out to be a metaphor for how to design a programming language that will stand the test of time. Well worth a watch!

In all ways but one, Kotlin's 'suspend' keyword is exactly the same as async/await in other language. Kotlin just tries to improve safety and readability by combining the 'async' and 'await' operations together. Instead of using 'await' to opt in to waiting, you use 'launch' to opt out of waiting.

I had fun coming up with a few jokes and puns for 📚 Kotlin Coroutine Confidence. There are even some hidden easter eggs! Chapter 6 teaches you coroutine cancellation and has at least three references to a specific video game 🎮. One is very well hidden, if you're looking for a challenge… 🎂

One of the fun parts of writing 📚 Kotlin Coroutine Confidence was finding sites and APIs for you to download data in all the hands-on asynchronous coding examples. In Chapter 6 we get highbrow with a tour of New York's Metropolitan Museum of Art! 🖼️ Very cool that they have a free public API.

"Gigantic jet lightning" near the Texas–Mexico border, photographed from the ISS by Nichole Ayers 🤯 You'll see tons more stunning photos like this when you connect to the NASA photo API in Chapter 2 of 📚 Kotlin Coroutine Confidence 🚀✨🛰️ 👉 Grab it at any bookstore, or lnkd.in/eGAyGMRR

I verified my second book with the folks at @medium.com (thank you!) so my profile page now lists two titles! Looks very professional, I like it 😎 👉 sam-cooper.medium.com/books

Breaking news: number goes up a bit Follow for more updates (it's gripping stuff)

Print copies of Kotlin Coroutine Confidence 📚 are starting to ship TODAY! If you've read it already, now is the time to leave a star rating on Amazon, Goodreads, etc—it really helps me out ❤️ ⭐️⭐️⭐️⭐️⭐️

I'm reading @sam-cooper.bsky.social's "Kotlin Coroutine Confidence". It's a masterpiece💫, even if you already know #Kotlin coroutine machinery: It's worth your money 💰: pragprog.com/titles/sckot...

Print version now available for preorder! 🎁 It's the perfect gift for the Kotlin lover in your life. Use this link if you're in the US, or search on your favourite site. Don't forget to support your local bookstores! 👉 bookshop.org/a/2696//9798...

Just added two new puzzles to 📚 Kotlin Brain Teasers! Take a look: pragprog.com/titles/kotli...

Just released the Beta 2.0 update for Kotlin Brain Teasers, with three new puzzles! You can find out more, leave your feedback, and grab your DISCOUNT code on the DevTalk forum, linked below. Tell me what you think of the new puzzles! forum.devtalk.com/t/kotlin-bra...

New in BETA - by Sam Cooper Level up the fun way! pragprog.com/titles/... Prepare for interviews, tests, competitions, real-world projects, and more with powered-up problem-solving proficiency, improved coding confidence, and lasting #Kotlin lessons. Most of all, have fun!

💡💬 "When judging the relative merits of #programming languages, some still seem to equate the ease of programming with the ease of making undetected mistakes." Written by Dijkstra in 1979; still true in 2025 😄. Don't use JavaScript, people! www.cs.utexas.edu/~E...

I'm rating my new #Kotlin Brain Teasers book using AI—if an LLM can solve it, it's a boring puzzle. Things are looking good for puzzle 1: "In Kotlin, if you try to write println(null + null) you will get a compile-time error." Wrong! Can you guess what really happens? pragprog.com/titles/kotli...

New book! 📚 Kotlin Brain Teasers is out now in early access beta. If you like #Kotlin and enjoy yelling "Wait, WHAT?!" at your IDE, this is the book for you. Reviewers said: "I hate this code so much" and "This code is actively making my day worse." 🧠🧩 pragprog.com/titles/kotli...

Got my ✅ Verified Author icon on Medium! Very proud to be able to showcase my upcoming book alongside all my other writing. ✍️ My Medium page: sam-cooper.medium.com

Leaked coroutine context and cascading cancellation 😬🔥. Here's a story about a couple of nasty bugs I ran into when adapting a Caffeine AsyncCache for use with #Kotlin #coroutines. Hope it can help others avoid the same issues in future! sam-cooper.medium.com/0b6e9fecad11

Me doing an interactive rebase: youtu.be/d9tcEAhQTR8...

Huge news if you're in the USA: you can preorder a print copy of my book RIGHT NOW! bookshop.org/a/2696/...

One of the places I learned most about #coroutines in #Kotlin was reading the source code for the sequence() builder—which isn't part of the coroutines library at all. Turns out asynchronous programming is just one of many ways to use the suspend keyword! sam-cooper.medium.co...

Cancellation is a huge part of how #Kotlin #coroutines keep your concurrent code safe and fast. Most of the time it just works, but when it doesn't, you need to know how to fix it. Here's my guide: sam-cooper.medium.co...#Kotlin#coroutines#concurrency #codingtips

Higher-order functions have to pick whether to be async or non-async—it's one of the major problems described in "What Color is Your Function" (🔗 link in comments). So I totally understand why Simon loves this #Kotlin #coroutines solution using 'inline'! nomisrev.github.io/inline-and-s...

Unlike other languages, #Kotlin makes you opt in explicitly when you want your #coroutines served with a side order of multitasking. Good choice or bad? #async #codingtips This tip is from Chapter 4 of 📚 Kotlin Coroutine Confidence. Get the Beta now! 👉 pragprog.com/titles/...