Swift Result extensions

ResultExtensions.swift

extension Result {
    func isSuccess() -> Bool {
        switch self {
        case .success(_): return true
        case .failure(_): return false
        }
    }
    func apply(_ f: (Success) -> ()) -> Result<Success, Failure> {
        if case let .success(s) = self {
            f(s)
        }
        return self
    }
    func applyError(_ f: (Failure) -> ()) -> Result<Success, Failure> {
        if case let .failure(err) = self {
            f(err)
        }
        return self
    }
    func filter(_ predicate: (Success) -> Bool, ifFalse: (Success) -> Failure) -> Result<Success, Failure> {
        switch self {
        case .success(let val): return predicate(val) ? .failure(ifFalse(val)) : .success(val)
        case .failure(let err): return .failure(err)
        }
    }
}

cred goes to @nyaray

Lolwat? :o

Hell yeah