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stephen-lazaro/map_n.scala Secret

Last active November 9, 2018 18:50
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map_n.scala
def map2[F[_]: Monoidal, A, B, C](fa: F[A], fb: F[B])(f: (A, B) => C): F[C] =
  Monoidal[F].map(Monoidal[F].product(fa, fb))(f.tupled)
def map3[F[_]: Monoidal](fa: F[A], fb: F[B], fc: F[C])(f: (A, B, C) => D): F[D] =
  Monoidal[F].map(
  Monoidal[F].product(Monoidal[F].product(fa, fb), fc))
  )({
  case ((a, b), c) => f(a, b, c)
  })
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