Limitation of the "when" function to 5 elements #1268

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1. mxcl commented on Sep 23, 2021

   

   mxcl

   on Sep 23, 2021

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   Without Swift variadic generics this is necessary. You can add the extension locally to your project, we don’t want to keep adding more of these. Thanks though.
2. mxcl

   closed this as completedon Sep 23, 2021
3. mxcl commented on Sep 23, 2021

   

   mxcl

   on Sep 23, 2021

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   As a general solution, we suggest use of when([Promise<T>]) in our documentation, where you void each promise first and get the values out the other end.

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4. Nikoloutsos commented on Feb 5, 2026

   

   Nikoloutsos

   on Feb 5, 2026

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   Although this is an old post writing this for future readers.

   @vicajilau from swift 5.9 and onwards we can use variadic generics like this. Allowing from 0..* elements.

   public func when<each U: Thenable>(fulfilled: repeat each U) -> Promise<(repeat (each U).T)> {
       var voidPromises: [Promise<Void>] = []
       repeat voidPromises.append((each fulfilled).asVoid())
       return _when(voidPromises).map(on: nil) { (repeat (each fulfilled).value!) }
   }

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5. RomanPodymov commented on Feb 14, 2026

   

   RomanPodymov

   on Feb 14, 2026

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   Hello @Nikoloutsos
   Thanks, let's add this to the project.
6. RomanPodymov

   reopened this on Feb 14, 2026
7. RomanPodymov

   closed this as completedin #1359on Feb 20, 2026