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flatMap
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| import UIKit | |
| func g(_ b: String) -> String { | |
| b | |
| } | |
| func f(_ s: String?) -> String? { | |
| guard let unwrappedS = s else { | |
| return nil | |
| } | |
| return g(unwrappedS) | |
| } | |
| func f2(_ s: String?) -> String? { | |
| s.flatMap{ g($0) } | |
| } | |
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