Scala Control Flow Projects
A research language with effect handlers and lightweight effect polymorphismProject mention: Effekt, a research language with effect handlers and lightweight polymorphism | news.ycombinator.com | 2021-11-19
How does this compare to other effect-oriented languages like Koka, Frank, and Eff?
I've been doing some work with Koka lately, but I briefly looked into the other three (including Effekt) and it mostly came down to, 'Koka seems most active in development' and 'Koka had the easiest to use documentation for me'.
 E.g. https://github.com/effekt-lang/effekt had its last commit back in June; https://github.com/frank-lang/frank last commit last year; but https://github.com/koka-lang/koka last update was Oct 15. Effekt seems semi-active, at least, compared to Frank. While stability is good, I wouldn't expect it in a language actively being used for research.
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