Type Casting Sample Code And Issues

概述Type Casting Sample Codehttps://github.com/xiruanliuwei/SwiftCodes/commit/ae24daedea3b4e695749c00acbe71e8b24dc518d1. "as?" returns "optional form"2. What is optional binding?

Type Casting Sample Codehttps://github.com/xiruanliuwei/SwiftCodes/commit/ae24daedea3b4e695749c00acbe71e8b24dc518d1. "as?" returns "optional form"2. What is optional binding?

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