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並前往https://livebook.manning.com/book/the-joy-of-clojure-second-edition/chapter-3/

Chapter 3. Dipping your toes in the pool - The Joy of Clojure ...

Clojure has one Boolean context: the test expression of the if form. ... (when (nil? nil) "Actually nil, not false") ;=> "Actually nil, not false".

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