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Clojure 1.12.4

Clojure 1.12.4 is now available! Find download and usage information on the Downloads page. CLJ-2924 - LazySeq - fix visibility issues with non-volatile reads

6 April 2026 at 06:09 pm
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Clojure 1.12.4

Clojure 1.12.4 has been released, bringing a new version of the popular functional programming language to the community. This update focuses on improving stability and addressing specific issues that developers have encountered. The release notes highlight a key fix in CLJ-2924, which resolves visibility problems with non-volatile reads in LazySeq.

LazySeq is a core data structure in Clojure that allows for efficient iteration over large sequences without loading the entire collection into memory. It is commonly used in scenarios where laziness is beneficial, such as processing large datasets or generating sequences on-the-fly. The issue addressed in CLJ-2924 involved non-volatile reads, which can lead to inconsistencies in multi-threaded environments. By fixing these visibility issues, Clojure 1.12.4 ensures that LazySeq behaves more predictably and reliably in concurrent applications.

In addition to the fix for CLJ-2924, Clojure 1.12.4 includes other minor improvements and bug fixes. These updates are essential for maintaining the stability and performance of the language, particularly for developers who rely on Clojure for building robust, high-performance systems.

To download Clojure 1.12.4, users can visit the official Downloads page. This page provides links to the binary distributions for various platforms, including Windows, macOS, and Linux. The installation process is straightforward, and users can follow the instructions provided to get the new version up and running quickly.

For those who are new to Clojure, it is worth noting that the language is designed for building scalable and maintainable applications. Its functional programming paradigm, combined with features like immutability and concurrency primitives, makes it a powerful tool for developers. Clojure's strong community and extensive library ecosystem further enhance its appeal, providing a wealth of resources and support for those looking to adopt the language.

In conclusion, Clojure 1.12.4 represents a significant update for the community, addressing critical issues and improving the overall reliability of the language. The fix for CLJ-2924 in LazySeq is particularly noteworthy, as it directly impacts the performance and correctness of multi-threaded applications. As always, the Clojure team continues to prioritize stability and innovation, ensuring that the language remains a top choice for developers seeking to build complex, high-performance systems. Developers are encouraged to update to the latest version to take advantage of these improvements and enjoy the benefits of a more robust Clojure experience.

Source: Clojure News
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