I've been beta-testing Haskell for Mac. I wish I'd had this tool when I was only starting out with learning Haskell several years ago. While I'm not a good Haskell programmer (I'm mostly a Mac developer), I do find that it helped me a lot in understanding functional paradigms and was very handy when Swift was released. Haskell for Mac brings easy installation, a large library of modules but most importantly — it brings Playgrounds, like for Swift.
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