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Language is swift 4) a) What are optionals and what are they used for? b) Give an example for unwrapping an optional that does not

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4) a) What are optionals and what are they used for? b) Give an example for unwrapping an optional that does not provide you with the benefits you listed in a) c) Give an example for unwrapping an optional that does provide you with the benefits you listed in a)

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