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A nice one
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enum Result<T, E> { | |
case value(T) | |
case error(E) | |
var value: T? { | |
switch self { | |
case .value(let value): | |
return value | |
case .error: | |
return nil | |
} | |
} | |
var error: E? { | |
switch self { | |
case .error(let error): | |
return error | |
case .value: | |
return nil | |
} | |
} | |
var isError: Bool { | |
switch self { | |
case .error: | |
return true | |
case .value: | |
return false | |
} | |
} | |
func onValue(_ closure: (T) -> ()) { | |
if let value = value { | |
closure(value) | |
} | |
} | |
func onError(_ closure: (E) -> ()) { | |
if let error = error { | |
closure(error) | |
} | |
} | |
func map<U>(_ transform: (T) throws -> U) rethrows -> Result<U, E> { | |
switch self { | |
case .value(let value): | |
return try .value(transform(value)) | |
case .error(let error): | |
return .error(error) | |
} | |
} | |
func flatMap<U>(_ transform: (T) throws -> Result<U, E>) rethrows -> Result<U, E> { | |
switch self { | |
case .value(let value): | |
return try transform(value) | |
case .error(let error): | |
return .error(error) | |
} | |
} | |
} |
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