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add combineAll alias for Foldable's fold #523

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Sep 11, 2015
Merged

add combineAll alias for Foldable's fold #523

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7 changes: 6 additions & 1 deletion core/src/main/scala/cats/Foldable.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,11 @@ import simulacrum.typeclass
A.combine(acc, a)
}

/**
* Alias for [[fold]].
*/
def combineAll[A: Monoid](fa: F[A]): A = fold(fa)

/**
* Fold implemented by mapping `A` values into `B` and then
* combining them using the given `Monoid[B]` instance.
Expand Down Expand Up @@ -211,7 +216,7 @@ trait CompositeFoldable[F[_], G[_]] extends Foldable[λ[α => F[G[α]]]] {
implicit def G: Foldable[G]

/**
* Left assocative fold on F[G[A]] using 'f'
* Left associative fold on F[G[A]] using 'f'
*/
def foldLeft[A, B](fga: F[G[A]], b: B)(f: (B, A) => B): B =
F.foldLeft(fga, b)((b, a) => G.foldLeft(a, b)(f))
Expand Down