Limitation of the "when" function to 5 elements

[vicajilau]

I am using PromiseKit version 6.15.3 and the when function is limited to 5 items. I have added a sixth element modifying the library locally. I don't know if a 6-parameter when function is a good practice and if it is considered good, I could perform a PR with these changes.

[mxcl]

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.

[mxcl]

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.

[Nikoloutsos]

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!) }
}

[RomanPodymov]

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