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並前往https://www.reddit.com/r/Clojure/comments/8f138f/please_use_the_idiom_seq_x_rather_than_not_empty_x/

Please use the idiom (seq x) rather than (not (empty? x)) - Reddit

So now you had a fn seq, which returns nil if empty coll, or a seq otherwise. From my understanding, clojure.core tries to be as minimal as it can.

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