I challenge any moral (fast/loose) reasoner to give a #scala impl of [A](List[A] => Int) that is not a constant, nor a function of length.
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@dibblego the index of the first repeated item in the list, or -1. Stylistically icky, but pure. Count of repeated items is less icky.
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@dibblego I copied and pasted it from an Eclipse Scala worksheet where it compiled and ran. http://pastebin.com/M0t05vmX -
@wbillingsley You used equals which violates parametricity and so is immoral. - Show replies
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