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並前往https://stackoverflow.com/questions/7744656/how-do-i-filter-elements-from-a-sequence-based-on-indexes/7745002

How do I filter elements from a sequence based on indexes

(defn filter-by-index [coll idxs] (keep-indexed #(when ((set idxs) ... (first %))) (map second))) clojure.core=> (filter-by-index ['a 'b 'c ...

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