ExecJS

ExecJS lets you run JavaScript code from Ruby. It automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Ruby object.

ExecJS supports these runtimes:

• therubyracer - Google V8 embedded within MRI Ruby
• therubyrhino - Mozilla Rhino embedded within JRuby
• Google V8
• Node.js
• Apple JavaScriptCore - Included with Mac OS X
• Mozilla Spidermonkey
• TODO Microsoft Windows Script Host (JScript)

A short example:

require "execjs"
ExecJS.eval "'red yellow blue'.split(' ')"
# => ["red", "yellow", "blue"]