Created
March 29, 2018 11:30
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func lift<A1, A2, R>(_ f: @escaping (A1, A2) -> R) -> ((Observable<A1>, Observable<A2>) -> Observable<R>) { | |
return { (a1: Observable<A1>, a2: Observable<A2>) -> Observable<R> in | |
return Observable.combineLatest(a1, a2).map(f) | |
} | |
} | |
func lift<A, R>(_ f: @escaping (A) -> Observable<R>) -> ((Observable<A>) -> Observable<R>) { | |
return { (a: Observable<A>) -> Observable<R> in | |
a.flatMap(f) | |
} | |
} | |
func lift <A1, A2, R>(_ f: @escaping (A1, A2) -> Observable<R>) -> ((Observable<A1>, Observable<A2>) -> Observable<R>) { | |
return { (a1: Observable<A1>, a2:Observable<A2>) -> Observable<R> in | |
Observable.combineLatest(a1, a2).flatMap(f) | |
} | |
} | |
struct Credentials { | |
let username: String | |
let password: String | |
} | |
let loginSignal = PublishSubject<Void>() | |
let usernameSubject = BehaviorSubject<String>(value: "") | |
let passwordSubject = BehaviorSubject<String>(value: "") | |
enum LoginResult { | |
case success, failure | |
} | |
func login(credentials: Credentials) -> Observable<LoginResult> { | |
if credentials.username == "pasi" && credentials.password == "password1" { | |
return Observable.just(.success) | |
} else { | |
return Observable.just(.failure) | |
} | |
} | |
let createCredentials = lift(Credentials.init) | |
let login_ = lift(login) | |
login_(loginSignal.withLatestFrom(createCredentials(usernameSubject, passwordSubject))).debug("login").subscribe() | |
usernameSubject.onNext("pasi") | |
passwordSubject.onNext("pasword") | |
loginSignal.onNext(()) | |
// login -> Event next(failure) | |
passwordSubject.onNext("password1") | |
loginSignal.onNext(()) | |
// login -> Event next(success) |
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