Whoops, typo, should have been:
"(if (<= (count component1) (count component2))"
Corrected:
(defn register-same-as [{:keys [keys->canonical
canonical->components]
:as component-graph}
key1 key2]
(let [canonical1 (keys->canonical key1 key1)
canonical2 (keys->canonical key2 key2)]
(if (= canonical1 canonical2) component-graph ; already the same
(let [component1 (canonical->components canonical1 [canonical1])
component2 (canonical->components canonical2 [canonical2])
;swap if necessary so component1 is the smaller component
[canonical1 canonical2 component1 component2] (if (<= (count
component1) (count component2))
[canonical1
canonical2 component1 component2]
[canonical2
canonical1 component2 component1])
new-keys->canonical (into keys->canonical (for [item
component1] [item canonical2]))
new-canonical->components (-> canonical->components
(dissoc canonical1)
(assoc canonical2 (into component2
component1)))]
{:keys->canonical new-keys->canonical, :canonical->components
new-canonical->components}))))
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