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SpiderMonkey

SpiderMonkey is Mozilla's implementation of a Javascript engine. It is written in C++. This is in contrast to Rhino which is written in Java.

Installation

On Ubuntu, SpiderMonkey apparently can be installed with

sudo apt install libmozjs-24-0v5 libmozjs-24-bin

On Windows, the shell can be installed with Chocolatey.

choco install -y jsshell

$ js24
js> var foo=39;
js> var bar=3;
js> foo+bar
42