Empty Should be Empty Why does empty cost so much in Java sometimes?

I have submitted a PR for #EclipseCollections with an EmptyLazyIterable implementation that is a singleton. I started with ImmutableCollection classes, as this is a no-brainer optimization there. Empty will soon be empty again. #EmptyShouldBeEmpty
donraab.medium.com/empty-should...

I had a great coding idea to reduce the startup memory cost of lazy iteration in #EclipseCollections. Turns out I had the same great idea once before and implemented it well over a decade ago. 🤷‍♂️ #ThisIsWhyIWriteThingsDown

Performance of Lazy and Eager Iteration Patterns on Small Lists in Java Exploring a blind spot in my Eclipse Collections performance benchmarks.

I think I figured out tonight how to make LazyIterable even more efficient in #EclipseCollections. It was already fairly efficient.
donraab.medium.com/performance-...

Explaining the Eclipse prefix in Eclipse Collections Eclipse Collections is a standalone open source collections library for Java

For folks who haven't looked at #EclipseCollections because they don't use the Eclipse IDE. Eclipse Collections (EC) and the Eclipse IDE are both independent projects at the Eclipse Foundation. 💡

Note: I created EC and have coded with IntelliJ for 24 years. 🙏
donraab.medium.com/explaining-t...

Interestingly, #EclipseCollections does not have an instance withAll method on MutableIntCollection that takes an IntStream, but there are ofAll/withAll methods on the IntLists factories that take an IntStream. 🤷‍♂️

What if the add and remove methods in java.util.Collection had fluent counterparts? Eclipse Collections has complements to add/remove that can be chained.

There are thousands of subtle design decisions we made in #EclipseCollections over the years. I write about them so folks have the benefit of being able to learn from them many years later. The methods with/without, withAll/withoutAll are interesting cases. 🙏
donraab.medium.com/what-if-the-...

Java Streams are great but it’s time for better Java Collections After 25 years, it’s time for Java to get a Collections upgrade.

Better collections in #Java are your choice. You can add #EclipseCollections as a dependency today, or tell the Core JDK team you want better collections in #Java, and hope enough developers ask and the work eventually gets prioritized. Your choice, or your voice. 🤷‍♂️
medium.com/javarevisite...

Tell Don’t Ask and Be Specific About the Return Type Learn how Bag is a natural return type for a method named countBy.

Many of us seem to be counting the days during these strange times. In this blog, you will learn how to count the days using #Java Streams and how to make the days count using #EclipseCollections.
donraab.medium.com/tell-dont-as...

The Ten Year Anniversary and the Next Five Years for Eclipse Collections Celebrating ten years of Eclipse Collections at the Eclipse Foundation.

When you change open source, open source changes you. Make the change, and celebrate the change in you. #EclipseCollections #Java
donraab.medium.com/the-ten-year...

This is not the Vibe Coding Book you are Looking for If you love programming, the book you are looking for may be in here.

Blog: This is not the Vibe Coding Book you are Looking for

If you love programming, the book you are looking for may be in here.

#Smalltalk #Java #EclipseCollections
donraab.medium.com/this-is-not-...

Mostly for converting Java Collections to #EclipseCollections, though I probably won't be doing wholesale conversion, just on a case-by-case basis.

Exception Handling in Eclipse Collections Some strategies for handling exceptions in Eclipse Collections before and after Java 8

Thanks for sharing! I wrote the following blog about "Exception Handling in #EclipseCollections" a few years ago. There's a link to a great blog from @brianvermeer.nl in here as well. 🙏
medium.com/javarevisite...

Oooooh, it’s been on my list to do after my current project, but hope to help this along!

#Java #OpenRewrite #EclipseCollections

liftwizard/liftwizard-utility/liftwizard-rewrite at main · liftwizard/liftwizard A collection of utilities for Dropwizard. Contribute to liftwizard/liftwizard development by creating an account on GitHub.

I was asked after the "Refactoring to #EclipseCollections" talk at dev2next 2025 whether there were any #OpenRewrite recipes for EC. My answer was "No, but it would be great if someone contributed some in OSS." Thx @cmotlin.bsky.social! 🙏 @zakhav.bsky.social @ted.dev
github.com/liftwizard/l...

The Author’s Inside Guide to Reading Eclipse Collections Categorically TL;DR — Read Chapters 1, 2, 3. Jump to 11. Skim 4–10. Dive in as desired.

My first book is available on Kindle Unlimited for four more days. This blog👇 can help you get the most out of the book with limited time. Enjoy! 🙏
#Java #Smalltalk #EclipseCollections
donraab.medium.com/the-authors-...

I need an index with this List iteration method Iterating over Lists in Java with indices using external and internal iterators

#EclipseCollections had forEachWithIndex as a method for almost 20 years. It also has several other "WithIndex" methods available for developers today. Java developers don't have to move to Kotlin to enjoy forEachWithIndex. 🤷‍♂️
medium.com/javarevisite...

Today's the day. Use the website for the offer, not the mobile app. I hope you'll get your copy to celebrate the 10 year anniversary of #EclipseCollections at the @eclipse.org . There is a story driven approach you might be surprised by here. Generations and U.S. Presidents included. Happy New Year!

youtube.com/watch?v=W5rn... #java #datastructures #eclipsecollections

The Ten Year Anniversary and the Next Five Years for Eclipse Collections Celebrating ten years of Eclipse Collections at the Eclipse Foundation.

Does your #Java collections code still read like it's 2015?

"A decade feels like a very long month"

Happy ten year anniversary #EclipseCollections. ❤️

donraab.medium.com/the-ten-year...

Merry Christmas! 🎄
Also, happy 10th Anniversary #EclipseCollections!

I always wanted an Eclipse Collections hat. My wife had two made for me with the EC logo. A triple surprise, since she didn't know that today was the 10th anniversary of EC. 🙏

Last chance until New Years for $0 ECC Kindle book. 👇

The #EclipseCollections #Java library has been FREE and OSS since Dec. 25, 2015. To celebrate the 10 year anniversary, you can get a free Kindle version of the "Eclipse Collections Categorically" book on Dec. 24 & 25, 2025 and Jan. 1, 2026. Happy Holidays! 🤗 🥂

Java Streams are great but it’s time for better Java Collections After 25 years, it’s time for Java to get a Collections upgrade.

GS Collections was open sourced by Goldman Sachs 14 years ago. The 10th anniversary of #EclipseCollections first release @eclipse.org is in 4 days. If you're waiting for new Collections in #Java after 30 years, the wait continues, while EC continues to grow & evolve. 💗🦋
medium.com/javarevisite...

December 25, 2025 is the ten year anniversary of #EclipseCollections first release at @eclipse.org . The anniversary blog is in progress. Stay tuned!

Free Kindle version! #Java Data Structures, using #EclipseCollections.

The next 5 years for Eclipse Collections My top 25 wish list for the future of Eclipse Collections development

The end of 2025 is drawing near. It's time to plan the next 5 years of #EclipseCollections. This month marks the 10th anniversary of #EclipseCollections as a project at the Eclipse Foundation. 👀🎉🥳

Let's look back 5 years to see the plan and mark the progress. 👇🙏
donraab.medium.com/the-next-5-y...

grouping jdk and eclipse fruity collections with groovy

Grouping collections with @groovy.apache.org to reveal many-to-many relationships:
groovy.apache.org/blog/fruity-...
#groovylang #manyToMany #eclipseCollections #jdkCollections

Mind Maps Didn’t Make Me Scroll How to view complete Java library package structures without scrolling.

My latest blog: Mind Maps Didn't Make Me Scroll

It only took me a few years to realize that mind maps could help me communicate the package design in the api and impl jars for the #EclipseCollections open source #Java library. Lesson learned and shared. 🙏
donraab.medium.com/mind-maps-di...

Eclipse Collections - Features you want with the collections you need.

Thanks to @zakhav.bsky.social for updating the #EclipseCollections website with the 12.0 and 13.0 releases! 🙏
eclipse.dev/collections/

Refactoring to Eclipse Collections with Java 25 at the dev2next Conference Showing what makes Java great after 30 years is the vibrant OSS ecosystem

Still waiting for the #Java of the future to solve all your collection problems? #EclipseCollections has been solving them since J2SE 1.4. Stop waiting. Start refactoring. Eclipse Collections makes Java look, feel, and run like a brand new programming language.
donraab.medium.com/refactoring-...

Refactoring to Eclipse Collections with Java 25 at the dev2next Conference Showing what makes Java great after 30 years is the vibrant OSS ecosystem

My latest blog: Refactoring to #EclipseCollections with #Java 25 at the #dev2next Conference

I really enjoyed giving this talk last week at @dev2next.bsky.social with my friend and co-speaker @zakhav.bsky.social.

Enjoy! 🙏
donraab.medium.com/refactoring-...