JavaScript shell
https://developer.mozilla.org/en/introduction_to_the_javascript_shell
https://developer.mozilla.org/en/JavaScript/Shells
The JavaScript shell is a command-line program included in the SpiderMonkey source distribution. It is the JavaScript equivalent of Python's interactive prompt, the Lisp read-eval-print loop, or Ruby's irb . This article explains how to use the shell to experiment with JavaScript code and run JavaScript programs.
To get the SpiderMonkey JavaScript shell, see the SpiderMonkey Build Documentation or download a compiled binary for your platform from the Nightly Builds .
For a list of other JavaScript shells, see JavaScript shells .
Using the JavaScript shell
The shell offers two modes of operation. You can use it as an interactive shell, in which you type JavaScript code at a prompt and get instant gratification, which is handy for experimenting or testing new features. You can also pass in, on the command line, a JavaScript program file to run, in which case the program is run automatically.
Note: Because the JavaScript shell is used as a test environment for the JavaScript engine, the available options and built-in functions can change over time.
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