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Whats the difference between “delete” and “undef” with hashes?

April 26, 2017delete hashes undef

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Whats the difference between “delete” and “undef” with hashes?

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Hashes are pairs of scalars: the first is the key, the second is the value. The key will be coerced to a string, although the value can be any kind of scalar: string, number, or reference.