object Fold
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implicit
def
ApplyFold[R, T]: Apply[[γ$10$]Fold[R, T, γ$10$]]
Apply instance
Apply instance
This means that we can write:
val mean: Fold[Int, Int] = (sum |@| count)(_ / _)
An Apply instance is also a Functor instance so we can write:
val meanTimes2 = mean.map(_ * 2)
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def
CobindFold[R, T]: Cobind[[γ$20$]Fold[R, T, γ$20$]]
Cobind instance
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implicit
def
ComposeFold[R]: Compose[[β$16$, γ$17$]Fold[R, β$16$, γ$17$]]
A Fold can be turned into a Compose
A Fold can be turned into a Compose
This allows us to write:
val scans = sum compose list
- implicit def MonoidSink[R, A]: Monoid[Fold[R, A, Unit]]
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implicit
def
ProfunctorFold[R]: Profunctor[[β$12$, γ$13$]Fold[R, β$12$, γ$13$]]
Profunctor instance
Profunctor instance
This is especially useful because we can "map" on the input element
val doubleSum = fromMonoid[Double] // sum all elements val roundedDoubleSum = doubleSum.mapfst(_.round)
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