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wjlow/traverse-and-sequence

Created January 20, 2017 04:39
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traverse
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traverse-and-sequence
val f: Int => Future[Person] = ???
val ids = List(1,2,3,4,5)
val persons: Future[List[Person]] = Future.traverse(ids, f) // parallel computation using Applicative
val persons2: List[Future[Person]] = ids map (id => f(id)) // sequential computation
persons2.sequence : Future[List[Person]] // now you can wait on one Future instead of many Futures
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