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| 1 | +# Rhino 1.9.0 |
| 2 | +## December 22, 2025 |
| 3 | + |
| 4 | +This release represents about a year of work on Rhino by a growing team of contributors. |
| 5 | + |
| 6 | +Some of the improvements include: |
| 7 | + |
| 8 | +* Compatibility improvements in areas like destructuring and spread syntax. |
| 9 | +* Performance improvements from 10 to 30% in benchmarks like Delta Blue, Earley-Boyer, and Crypto in both interpreted and compiled mode |
| 10 | +* Better support for generics and other things when Java integration is used. |
| 11 | + |
| 12 | +Some other improvements: |
| 13 | + |
| 14 | +JavaScript Language Updates: |
| 15 | + * ES6+: Significant advancements in destructuring, spread syntax for |
| 16 | + arrays/objects, Symbol API, and improved let/const scoping. |
| 17 | + TypedArray.from/of and BigInt.asUintN/asIntN fixes. |
| 18 | + * RegExp: New features like named capture groups, lookbehind |
| 19 | + assertions, and Unicode mode support. |
| 20 | + * Future ES (ES2024/2025): Early implementation of proposals such as |
| 21 | + Promise.withResolvers, Promise.try, ArrayBuffer transfer methods, and |
| 22 | + new Set methods. |
| 23 | + |
| 24 | +Core Engine Enhancements: |
| 25 | + * Major Refactoring: Extensive migration of built-in objects to a |
| 26 | + lambda-based architecture and a comprehensive overhaul of the |
| 27 | + interpreter bytecodes for better performance and maintainability. |
| 28 | + * Concurrency & Interop: Continued focus on thread safety improvements |
| 29 | + and enhanced Java interoperability, including better generics |
| 30 | + support. |
| 31 | + |
| 32 | +Going forward -- we have lots of plans for Rhino, including some changes that may |
| 33 | +affect compatibility for projects that embed Rhino into larger frameworks. We think |
| 34 | +that these changes will be worth it because they will unlock better language |
| 35 | +compatibility and performance. |
| 36 | + |
| 37 | +As such, the next version going forward will be 2.0.0-SNAPSHOT. |
| 38 | + |
| 39 | +Thanks to everyone who contributed! |
| 40 | + |
1 | 41 | # Rhino 1.8.1, Rhino 1.7.15.1, Rhino 1.7.14.1 |
2 | 42 | ## December 2, 2025 |
3 | 43 |
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