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/Optional+where Secret

Created January 26, 2017 22:53
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Optional+where
extension Optional {
public init(_ value: Wrapped, where predicate: (Wrapped) -> Bool) {
self = predicate(value) ? value : nil
}
}
func getUserInput() -> String {
return ""
}
Optional(getUserInput(), where: { !$0.isEmpty }) ?? "no value"
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