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Seedless versions of .fold (aka .reduce) and .scan #743

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Seedless versions of .fold (aka .reduce) and .scan #743

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@semmel semmel commented Jul 15, 2019

  • For consistency the seed value is optional in .fold and .scan too.
  • Type signature for .fold and .scan similar to the proposed signature of .flatScan.
  • Implementation of .scanSeedless is rather naive.
    • Maybe that's why I had to mark many unit tests unstable ("switching aggressively" mode did always fail - don't know why)
    • In doubt what UpdateBarrier.whenDoneWith() is, so I simply removed it for .scanSeedless
  • Duplicated most unit tests to check the seedless methods.

TODO: Update documentation

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