I like how easy it is to write code in eta. That's really nice for a beginner! It's also not that hard to learn once you get the hang of things. The IDE can be a bit slow at times but that just comes with any Java IDE. I would say that if you are new to functional programming then this might not be the best choice. If you have some experience with functional programming then I don't think there is much to dislike. It's very simple and straightforward. Once you understand how to use it then writing code becomes much easier than other languages.
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