Which version of the ECMAScript standard does Java's JavaScript engine Rhino support, how much work is going into fixing bugs and keeping the implementation in sync with the latest standardized version?
4 Answers
From Java 12 documentation:
https://docs.oracle.com/en/java/javase/12/docs/api/jdk.scripting.nashorn/module-summary.html
Nashorn is 100% compliant with the ECMA-262 Standard, Edition 5.1
About the compatilibity with ES2015/ES6 only, you have this webpage from the Mozilla's official repository :
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