How to Combine Multiple Set Operations, i.e. take the Union of 3 sets?

• rfcs

  666 5,711 9.8 Markdown

  RFCs for changes to Rust

  

let sets = [h_a, h_b, h_c]; // from https://github.com/rust-lang/rfcs/issues/2023 let intersection = sets .iter() .skip(1) .fold(sets[0].clone(), |acc, hs| { acc.intersection(hs).cloned().collect() });

• advent-of-code-2022

  27 2 10.0 TypeScript

  Repo containing solutions for Advent of Code 2022 (by ste001)

While an experienced programmer, I'm just starting to learn Rust by doing this year's Advent of Code in it. For today's problem Day 03 , I needed to find the intersection of three sets of characters. Using HashSet, I'd expected to be able to do something along the lines of this:

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• advent_2022

  1 0 8.8 Rust

  Advent of Code 2022, Rust

My final version is here if anyone wants some more context, though please limit any feedback to this particular operation (I've got a lot of learning to go). Looking at other's solutions, everyone appeared to either go to chained functional calls like the above (fold, map, filter, etc.) or just implementing intersection from scratch. While I appreciate the elegance of the former approach, I find it, regardless of the language, pretty opaque.

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