V8 is the fastest, because it compiles all JS to machine code. SpiderMonkey (what FF uses) is fast too, but compiles to an intermediate byte-code, not machine code. That's the major difference with V8. EDIT- Newer Firefox releases come with a newer variant of SpideMonkey; TraceMonkey.
Support for Moziall Rhino and the API V1 is deprecated. It will be removed end of 2022.
The project gets its name from the animal on the cover of the JavaScript book from O'Reilly Media. As of version 1.7R11 (May 2019), Rhino supports Java 8 and up, and supports a number of ECMAScript ES6/ES2015 features.
I noticed ubuntu 10.04 removed the spidermonkey package. Rhino looks like it's still there though. What are the differences between rhino and spidermonkey (besides what language they're written in). And why did they remove spidermonkey?
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