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After shipping several production applications in Elm over the last five years... I can confirm that the development experience is an absolute joy.

With a compiler this helpful, and sub-second builds-on-save - you get really tight feedback loops.

I can't say enough good of it.

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If you enjoy tight feedback loops and want something even quicker than "rebuild on save", you should try something like Clojure and hook up your editor to a REPL running in the background. Rather than "recompile the whole program on save", you can send small snippets to be evaluated in the live environment, updating your program on the fly :)

I was fairly happy doing REPL development with Scheme, and then I decided to give Common Lisp a try and I discovered what REAL REPL-driven development is.

The first time I changed some data representation from a defclass to a defstruct and SBCL asked me what I wanted to do with existing instances of the type was mindblowing.

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