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並前往https://www.knitelius.com/2017/01/04/swift-for-beans-about-null-nil-and-optional-orelse/

Swift for Beans – about null, nil and Optional.orElse(“?!”)

In Swift variables may not be assigned nil (null), either they have to be initialized with a value or declared as an ? optional. 1. 2. 3. var ...

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