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並前往https://www.freecodecamp.org/news/a-quick-and-thorough-guide-to-null-what-it-is-and-how-you-should-use-it-d170cea62840/

A quick and thorough guide to 'null' - freeCodeCamp

Please note also that some programming languages support only reference types, others support only value types, and some (e.g. C# and Java) ...

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