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A pure functional language which compiles to Javascript, Elm makes the bold - but justified - claim of guaranteeing *no* runtime exceptions in the output JS. It manages this by being a strongly-typed, "pure" functional language - inspired by Haskell, but less abstract and therefore easier for beginners to functional programming to pick up - in which invalid programs will simply not compile (the compiler gives very helpful and explicit error messages too). Combined with strong performance, this is a language I intend to use a lot more in the future for building the front-ends of personal projects - and I believe it is only its relatively small library ecosystem and perceived difficulty of teaching to developers that have prevented it being more widely used in production.

Link: https://elm-lang.org/

Projects I've used this tech for: