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並前往https://www.markhneedham.com/blog/2009/11/21/clojure-checking-for-a-nil-value-in-a-collection/

Clojure: Checking for a nil value in a collection - Mark Needham

I initially incorrectly thought the 'http://clojure.org/api#toc170[contains?]' function was the one that I wanted: (contains? '(1 nil 2 3) ...

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