Because you already knew Haskell and you knew what open sum types are. You learn... | Hacker News

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		throw1234651234 on Nov 20, 2019 \| parent \| context \| favorite \| on: Ask HN: What's the most valuable thing you can lea... Because you already knew Haskell and you knew what open sum types are. You learned some semantics.

Jeff_Brown on Nov 20, 2019 [–]

All true. I would only add that learning "mere semantics" in many cases allows you to use a powerful new tool.

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