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blouerat/foldMapF.scala

Created September 3, 2015 11:04
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OptionT.foldMapF
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foldMapF.scala
def foldMapF[F[_]: Monad, A, B](o: OptionT[F, A], f: A => B)(implicit M0: Monoid[B]): F[B] = o.fold(f, M0.zero)
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