8000 Missing combinator: whenAllResult · Issue #24 · tomlokhorst/Promissum · GitHub
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Missing combinator: whenAllResult #24

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tomlokhorst opened this issue Aug 30, 2016 · 0 comments
Open

Missing combinator: whenAllResult #24

tomlokhorst opened this issue Aug 30, 2016 · 0 comments

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@tomlokhorst
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tomlokhorst commented Aug 30, 2016 •
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public func whenAllResult<Value, Error>(promises: [Promise<Value, Error>]) -> Promise<[Result<Value, Error>], NoError> {
  let source = PromiseSource<[Result<Value, Error>], NoError>()
  var results = promises.map { $0.result }
  var remaining = promises.count

  if remaining == 0 {
    source.resolve([])
  }

  for (ix, promise) in promises.enumerate() {

    promise
      .finallyResult { result in
        results[ix] = result
        remaining = remaining - 1

        if remaining == 0 {
          source.resolve(results.map { $0! })
        }
    }
  }

  return source.promise
}
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