I still don't get it. I don't think I ever will. Contra/covariance hurts my brain.
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I love the metal reference
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Everytime I try to understand covariance I end up dowm some rabbit hole. And the Rabbit can't even live in the Rabbit Hole since Rabbit is a subclass of Animal that means it's not covariant or something, so Rabbit has to live a Burrow. It's terrible.
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The producer vs consumer terminology helps, together with those mirrored tables. I find the Kotlin language did a good job in this area by using in/out instead of super/extends.
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Can we get drop the overloaded terminology? I'm pretty sure co-variance was claimed by the field of statistics first...
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That's probably the bestest explanation of contravariance I've ever seen. Hat tip sir!
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clearly (as one who still have trouble spotting contravariance… and suffering from that since my C++ and then C# 2 years)
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The duality really shows here
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Čini se da učitavanje traje već neko vrijeme.
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