JavaScript

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JavaScript is supported out of the box in Emacs, see js-mode.

JavaScript REPL

Have a look at mozrepl - a REPL for interacting with an external web browser's internal JavaScript engine. However MozRepl seems to be unmaintained. There is swank-js which is browser independent and based on Node.JS and SLIME.

Other JavaScript modes

  • js2-mode by Steve Yegge is one of the most complete JavaScript modes. It boasts run-time validation of JavaScript.