HashMap<&str, u8> to HashMap<u8, &str>

help
#1

Is there a convenient way of turning std::collections::HashMap<&str, u8> to std::collections::HashMap<u8, &str>, i.e. swapping keys and values, or I need to rebuild it myself? Thanks

#2

It's a one-liner using iterator adaptors:

let new: HashMap<u8, &str> = old.into_iter().map(|(k, v)| (v, k)).collect();
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#3

Note that this will pick an arbitrary &str for each collision. If you want to do something else, the code will get a bit more complicated.

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#4

Yeah, I meant iterators when said “rebuild it myself". Ok, thanks, I understood there’s no abstraction for this :slight_smile: