Our first operator in the decoding process, <^>, is used to map our curried init method over a value. The definition is as follows:

public func <^> <T, U>(f: (T) -> U, x: Decoded<T>) -> Decoded<U> { 
    return x.map(f) 
} 

func map<U>(_ f: (T) -> U) -> Decoded<U> { 
    switch self { 
    case let .success(value): return .success(f(value)) 
    case let .failure(error): return .failure(error) 
    } 
}