Can some one tall me when are the Swift Student Challenge i want to join it
Historically, Swift Student Challenge has run yearly, with the challenge being announced around this time and finishing about a quarter of the way into the next year. You can learn more about this from Developer > Swift Student Challenge and the various posts on Developer > News.
Right now there are no announced future challenges, so my advice is that you monitor Developer > News for updates (it even has a neat-o RSS feed).
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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