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I notice Scala missing from your list - if you need the JVM or find Elm to not quite have what you need, it's a great language. It's basically the opposite end of the spectrum, design-wise - Elm is "let's create this highly opinionated, carefully curated language and try to make it perfect" and Scala is "let's throw every feature we can derive into our type system and let people work it out".

It's got it's issues (mostly that it's incredibly easy to abuse powerful features), but it also has a ton of stuff I really miss in other languages.

I have a web-based party game (CaH clone) I wrote in Scala for the back-end, Elm for the front-end. It's a bit old (I'm planning a rework and update when the next version of Elm comes out), and it's definitely not the best code ever as it's a hobby project, but you might be interested.

https://github.com/lattyware/massivedecks




Scala's flaw - and Elm's strength - is it is a massive language that allows for a large amount of magic to happen. Elm is by comparison tiny and extremely explicit, and error messages thrown by the compiler are almost always super helpful. But Elm can't (really) be used on the server, so it doesn't hurt to look at Scala there, though be prepared to have a hard time finding experienced engineers to hire.


Id argue that while Scala has more powerful features, it has less "magic". Elm can't be used on the server because it has a magical create app function that you must feed the exact right functions into in order to make anything. AFAIK it's not a general purpose language.


Definitely not general purpose, but it has nothing asking the line of implicits and implicit type conversion and the such that makes reading Scala code impossible to read, if not write, without a tool like IntelliJ.


I find it best to use Scala's implicit stuff for things that would be completely invisible in another language (e.g. "this line might fail with an error" or "this line accesses the database"). That way if you're reading in a plain text editor you're no worse off than you were in, say, Python, but if you use a tool like IntelliJ (and you should!) then the GUI is enhancing your experience, telling you more about your code and reducing the need to click around library code to understand what the code you're reading is doing.


We have different definitions of 'magic'. `Html.program` is magic, `comparable` is magic. Elm has been steadily removing features and adding magic since they lost `Signals`




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