cats.syntax.reducible.scala Maven / Gradle / Ivy
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package cats
package syntax
trait ReducibleSyntax extends Reducible.ToReducibleOps {
implicit final def catsSyntaxNestedReducible[F[_]: Reducible, G[_], A](fga: F[G[A]]): NestedReducibleOps[F, G, A] =
new NestedReducibleOps[F, G, A](fga)
}
final class NestedReducibleOps[F[_], G[_], A](private val fga: F[G[A]]) extends AnyVal {
def reduceK(implicit F: Reducible[F], G: SemigroupK[G]): G[A] = F.reduceK(fga)
}
private[syntax] trait ReducibleSyntaxBinCompat0 {
implicit final def catsSyntaxReducibleOps0[F[_], A](fa: F[A]): ReducibleOps0[F, A] =
new ReducibleOps0[F, A](fa)
}
final class ReducibleOps0[F[_], A](private val fa: F[A]) extends AnyVal {
/**
* Apply `f` to each element of `fa` and combine them using the
* given `SemigroupK[G]`.
*
* {{{
* scala> import cats._, cats.data._, cats.implicits._
* scala> val f: Int => Endo[String] = i => (s => s + i)
* scala> val x: Endo[String] = NonEmptyList.of(1, 2, 3).reduceMapK(f)
* scala> val a = x("foo")
* a: String = "foo321"
* }}}
* */
def reduceMapK[G[_], B](f: A => G[B])(implicit F: Reducible[F], G: SemigroupK[G]): G[B] = F.reduceMapK[G, A, B](fa)(f)
def reduceA[G[_], B](implicit F: Reducible[F], ev: A <:< G[B], G: Apply[G], B: Semigroup[B]): G[B] =
F.reduceA[G, B](fa.asInstanceOf[F[G[B]]])
}