It's actually really frustrating how folks in the Golang world consistently fight against generics. I get you may not be building data structures. But maybe you'll consume the work of the people who do?
Rob Pike is arguing that you don’t need filter/map/etc. in a language. The one thing that is holding Go back from being able to express those functions is generics. So Rob Pike is arguing against generics.
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The only reason you would argue against map/filter/etc is to argue against generics. And map/filter/fold are actually pretty interesting when you look at it from an optimization POV. But even more important are parallel versions of those, which demand generics.
End of conversation
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