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this post was submitted on 16 Nov 2023
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Programming
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This is a cool idea. There are other programming languages that have libraries that expose similar behavior. For instance, Rust has the uom crate, Haskell has the units package, and C++ has the header only library SI.
But there is something to be said about it being built in.
The web page says other libraries implement units whereas they implement dimensions. 1 cm and 1 inch has the same dimension, namely length, and you are able to add them together and get a correct result. seems nice. I don't know if it'll have any practical benefit but I like it.
I can't talk about the other libraries but the uom crate does the same thing.
The dimensions are encoded as a vector of generics, allowing you to get the correct unit even when dividing a distance by time for example.
It's quite the clever use of Rusts type system.