Jasper is an experimental language that brings javascript halfway to arc. It's still pretty much in flux.

Try jasper in your browser at http://ema-fox.github.io/jasper

It differs from arc by

• representing lists by arrays and not cons cells.
• having no TCO.
• being ugly.

It differs from javascript by

• having macros.
• everything is an expression.

After cloning this repo, get the compiler:

$ wget ema-fox.github.io/jasper/compile.jpr.js

Compile your copy of the compiler:

$ node compile.jpr.js parse.jpr libcompile.jpr compile.jpr

Run the repl:

$ node compile.jpr.js -i
¿ (map [+ _ 1] '(1 2 3))
(2 3 4)
¿ 

Use the -w option if you want the compiler to automatically recompile when its input files change. (Like coffeeScript does it)