Result Values - Swift Programming

Result stores either a success value or a failure value for later handling.

Store success or failure

result_values.swift

enum LookupError: Error {
    case missing
}

func lookupName(_ id: Int) -> Result<String, LookupError> {
    if id == 1 {
        return Result<String, LookupError>.success("Ada")
    }
    return Result<String, LookupError>.failure(LookupError.missing)
}

let userId = 
let result = lookupName(userId)
let name = try? result.get()
let message = name == nil ? "missing user" : "user=\(name!)"

print(message)

enum LookupError: Error {
    case missing
}

func lookupName(_ id: Int) -> Result<String, LookupError> {
    if id == 1 {
        return Result<String, LookupError>.success("Ada")
    }
    return Result<String, LookupError>.failure(LookupError.missing)
}

let userId = 
let result = lookupName(userId)
let name = try? result.get()
let message = name == nil ? "missing user" : "user=\(name!)"

print(message)

result `Result` lets code pass an error outcome as data instead of throwing immediately.