js-comint.el: "You can then try out any piece of javascript code in a javascript interpreter by simply typing C-x C-e at the end of the sexp. js-comint will use js2-mode to find the last sexp, run Rhino, and load the sexp it just found into the interpreter. This, it turns out, is extremely useful, particularly when you're writing non-domish, algorithmic javascript.
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'via Blog this'
