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compose operator for RxSwift
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struct ComposeTransformer<T, R> { | |
let transformer: (Observable<T>) -> Observable<R> | |
init(transformer: @escaping (Observable<T>) -> Observable<R>) { | |
self.transformer = transformer | |
} | |
func call(_ observable: Observable<T>) -> Observable<R> { | |
return transformer(observable) | |
} | |
} | |
extension ObservableType { | |
func compose<T>(_ transformer: ComposeTransformer<E, T>) -> Observable<T> { | |
return transformer.call(self.asObservable()) | |
} | |
} |
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// ================== | |
// before | |
Observable.just([1, 2, 3, 4, 5]) | |
.map{ $0.reduce(0, +) } | |
.subscribeOn(SerialDispatchQueueScheduler(qos: .default)) | |
.observeOn(MainScheduler.instance) | |
.subscribe({ event in | |
print(event) | |
}) | |
// ================== | |
// after (1) | |
Observable.just([1, 2, 3, 4, 5]) | |
.map{ $0.reduce(0, +) } | |
.compose(ComposeTransformer<Int, Int> { observable in | |
return observable | |
.subscribeOn(SerialDispatchQueueScheduler(qos: .default)) | |
.observeOn(MainScheduler.instance) | |
}).subscribe({ event in | |
print(event) | |
}) | |
// =================== | |
// after (2) | |
let composeTransformer = ComposeTransformer<Int, Int> { observable in | |
return observable | |
.subscribeOn(SerialDispatchQueueScheduler(qos: .default)) | |
.observeOn(MainScheduler.instance) | |
} | |
Observable.just([1, 2, 3, 4, 5]) | |
.map{ $0.reduce(0, +) } | |
.compose(composeTransformer) | |
.subscribe({ event in | |
print(event) | |
}) |
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