<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Here is some Swift 3 code that allows simple repeatable repeatable random sequences by conforming to a protocol:<div class=""><a href="https://gist.github.com/jonhull/3655672529f8cf5b2eb248583d2cafb9" class="">https://gist.github.com/jonhull/3655672529f8cf5b2eb248583d2cafb9</a></div><div class=""> </div><div class="">I now use a slightly more complicated version of this which allows more complex types (like colors) to be added and constrained in more interesting ways than just from…to (e.g. Colors with a fixed lightness/brightness, but a range in hue). The base is pretty much the same.</div><div class=""><br class=""></div><div class="">I have found that user-facing code often needs the idea of repeatable/re-creatable randomness. I originally created it to create a sketchy version of lines that had random offsets added to points along the line. If the randomness wasn’t reproducible, then the sketchiness of the line would shift around randomly every time there was a change.</div><div class=""><br class=""></div><div class="">The code I have provided above is not useful for any sort of cryptography/security though. There are different reasons for randomness. Maybe that is something we should consider?</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Jon</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 8, 2017, at 9:52 AM, Alejandro Alonso via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Hello swift evolution, I would like to propose a unified approach to `random()` in Swift. I have a simple implementation here <a href="https://gist.github.com/Azoy/5d294148c8b97d20b96ee64f434bb4f5" class="">https://gist.github.com/Azoy/5d294148c8b97d20b96ee64f434bb4f5</a>.
This implementation is a simple wrapper over existing random functions so existing code bases will not be affected. Also, this approach introduces a new random feature for Linux users that give them access to upper bounds, as well as a lower bound for both
Glibc and Darwin users. This change would be implemented within Foundation.
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<div class="">I believe this simple change could have a very positive impact on new developers learning Swift and experienced developers being able to write single random declarations.</div>
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<div class="">I’d like to hear about your ideas on this proposal, or any implementation changes if need be.</div>
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<div class="">- Alejando</div>
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