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Oh yea, that's the good stuff huffs glue
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this post was submitted on 15 Nov 2023
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Is this how you do Fin in peasant languages?
No, not at all. It's a joke post, abusing the in-memory representation of the
Optiontype to construct numbers. When nesting theOptiontype, it turns into a densely packed bit vector...And if I understand the purpose of
Fincorrectly, you're picking on the one 'peasant language' that actually has something like that built-in.In Rust, you can specify the type of an array as e.g
[u8; 3]. Which is an array containing values of typeu8(unsigned 8-bit integer) with a fixed, compile-time-guaranteed length of3. So,[u8; 3]could be used to represent an RGB color, for example.It is an array, not a set, but well, close enough.
Finis a type of finite oridinals bounded by a nat. For example theWTFtype in there is the same type asFin 8.Of course every language can have
Finwith a fixed integer, like the post suggest, by just stacking options.However for a properly defined
Fintype, the input number is dynamic, serves as a bound for the element of the type. For example, Adga was able to type the fact thatnth fibonacci number is a finite ordinal bounded by a function ofn. Which I believe is not typable in rust?