trait Semigroupal[F[_]] extends Serializable
Semigroupal captures the idea of composing independent effectful values.
It is of particular interest when taken together with Functor - where Functor
captures the idea of applying a unary pure function to an effectful value,
calling product
with map
allows one to apply a function of arbitrary arity to multiple
independent effectful values.
That same idea is also manifested in the form of Apply, and indeed Apply extends both Semigroupal and Functor to illustrate this.
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- @implicitNotFound("Could not find an instance of Semigroupal for ${F}") @typeclass(simulacrum.this.typeclass.<init>$default$1, simulacrum.this.typeclass.<init>$default$2)
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- abstract def product[A, B](fa: F[A], fb: F[B]): F[(A, B)]
Combine an
F[A]
and anF[B]
into anF[(A, B)]
that maintains the effects of bothfa
andfb
.Combine an
F[A]
and anF[B]
into anF[(A, B)]
that maintains the effects of bothfa
andfb
.Example:
scala> import cats.implicits._ scala> val noneInt: Option[Int] = None scala> val some3: Option[Int] = Some(3) scala> val noneString: Option[String] = None scala> val someFoo: Option[String] = Some("foo") scala> Semigroupal[Option].product(noneInt, noneString) res0: Option[(Int, String)] = None scala> Semigroupal[Option].product(noneInt, someFoo) res1: Option[(Int, String)] = None scala> Semigroupal[Option].product(some3, noneString) res2: Option[(Int, String)] = None scala> Semigroupal[Option].product(some3, someFoo) res3: Option[(Int, String)] = Some((3,foo))
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