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visibletrap/swap-group.clj

Last active May 3, 2018 06:06
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Given input: {1 [:a :b], 2 [:a], 3 [:b], 4 [:b :c], 5 [:a], 6 [:a :c :e]}. Expected output: {:a [1 2 5 6], :b [1 3 4], :c [4 6], :e [6]}
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swap-group.clj
(->> {1 [:a :b], 2 [:a], 3 [:b], 4 [:b :c], 5 [:a], 6 [:a :c :e]}
(map (fn [[k v]] (zipmap v (repeat [k]))))
(apply merge-with into))
;=> {:a [1 2 5 6], :b [1 3 4], :c [4 6], :e [6]}
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