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class HNCommentFeed : ObservableObject{ | |
let nlTagger = NLTagger(tagSchemes: [.sentimentScore]) | |
let didChange = PassthroughSubject<Void, Never>() | |
var cancellable : Set<AnyCancellable> = Set() | |
@Published var sentimentAvg : String = "" | |
var comments = [CommentItem](){ | |
didSet { | |
var sumSentiments : Float = 0.0 | |
for item in comments{ | |
let floatValue = (item.sentimentScore as NSString).floatValue | |
sumSentiments += floatValue | |
} | |
let ave = (sumSentiments) / Float(comments.count) | |
sentimentAvg = String(format: "%.2f", ave) | |
didChange.send() | |
} | |
} | |
private var commentIds = [Int]() { | |
didSet { | |
fetchComments(ids: commentIds.prefix(10)) | |
} | |
} | |
func fetchComments<S>(ids: S) where S: Sequence, S.Element == Int{ | |
Publishers.MergeMany(ids.map{FetchComment(id: $0, nlTagger: nlTagger)}) | |
.collect() | |
.receive(on: DispatchQueue.main) | |
.sink(receiveCompletion: { | |
if case let .failure(error) = $0 { | |
print(error) | |
} | |
}, receiveValue: { | |
self.comments = self.comments + $0 | |
}) | |
.store(in: &cancellable) | |
} | |
func getIds(ids: [Int]){ | |
self.commentIds = ids | |
} | |
} |
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