trait InvariantSemigroupal[F[_]] extends Semigroupal[F] with Invariant[F]
InvariantSemigroupal is nothing more than something both invariant and Semigroupal. It comes up enough to be useful, and composes well
- Self Type
- InvariantSemigroupal[F]
- Source
- InvariantSemigroupal.scala
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Abstract Value Members
- abstract def imap[A, B](fa: F[A])(f: (A) => B)(g: (B) => A): F[B]
Transform an
F[A]into anF[B]by providing a transformation fromAtoBand one fromBtoA.Transform an
F[A]into anF[B]by providing a transformation fromAtoBand one fromBtoA.Example:
scala> import cats.syntax.all._ scala> import scala.concurrent.duration._ scala> val durSemigroup: Semigroup[FiniteDuration] = | Invariant[Semigroup].imap(Semigroup[Long])(Duration.fromNanos)(_.toNanos) scala> durSemigroup.combine(2.seconds, 3.seconds) res1: FiniteDuration = 5 seconds
- Definition Classes
- Invariant
- 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 bothfaandfb.Combine an
F[A]and anF[B]into anF[(A, B)]that maintains the effects of bothfaandfb.Example:
scala> import cats.syntax.all._ 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))
- Definition Classes
- Semigroupal
Concrete Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- final def ==(arg0: Any): Boolean
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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- def compose[G[_]](implicit arg0: Invariant[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]andG[_]then produceInvariant[F[G[_]]]using theirimap.Compose Invariant
F[_]andG[_]then produceInvariant[F[G[_]]]using theirimap.Example:
scala> import cats.syntax.all._ scala> import scala.concurrent.duration._ scala> val durSemigroupList: Semigroup[List[FiniteDuration]] = | Invariant[Semigroup].compose[List].imap(Semigroup[List[Long]])(Duration.fromNanos)(_.toNanos) scala> durSemigroupList.combine(List(2.seconds, 3.seconds), List(4.seconds)) res1: List[FiniteDuration] = List(2 seconds, 3 seconds, 4 seconds)
- Definition Classes
- Invariant
- def composeApply[G[_]](implicit arg0: Apply[G]): InvariantSemigroupal[[α]F[G[α]]]
- def composeContravariant[G[_]](implicit arg0: Contravariant[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]and ContravariantG[_]then produceInvariant[F[G[_]]]using F'simapand G'scontramap.Compose Invariant
F[_]and ContravariantG[_]then produceInvariant[F[G[_]]]using F'simapand G'scontramap.Example:
scala> import cats.syntax.all._ scala> import scala.concurrent.duration._ scala> type ToInt[T] = T => Int scala> val durSemigroupToInt: Semigroup[ToInt[FiniteDuration]] = | Invariant[Semigroup] | .composeContravariant[ToInt] | .imap(Semigroup[ToInt[Long]])(Duration.fromNanos)(_.toNanos) // semantically equal to (2.seconds.toSeconds.toInt + 1) + (2.seconds.toSeconds.toInt * 2) = 7 scala> durSemigroupToInt.combine(_.toSeconds.toInt + 1, _.toSeconds.toInt * 2)(2.seconds) res1: Int = 7
- Definition Classes
- Invariant
- def composeFunctor[G[_]](implicit arg0: Functor[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]and FunctorG[_]then produceInvariant[F[G[_]]]using F'simapand G'smap.Compose Invariant
F[_]and FunctorG[_]then produceInvariant[F[G[_]]]using F'simapand G'smap.Example:
scala> import cats.syntax.all._ scala> import scala.concurrent.duration._ scala> val durSemigroupList: Semigroup[List[FiniteDuration]] = | Invariant[Semigroup] | .composeFunctor[List] | .imap(Semigroup[List[Long]])(Duration.fromNanos)(_.toNanos) scala> durSemigroupList.combine(List(2.seconds, 3.seconds), List(4.seconds)) res1: List[FiniteDuration] = List(2 seconds, 3 seconds, 4 seconds)
- Definition Classes
- Invariant
- final def eq(arg0: AnyRef): Boolean
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- def equals(arg0: AnyRef): Boolean
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- def finalize(): Unit
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- final def getClass(): Class[_ <: AnyRef]
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- def hashCode(): Int
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- final def isInstanceOf[T0]: Boolean
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- final def ne(arg0: AnyRef): Boolean
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- final def notify(): Unit
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- final def notifyAll(): Unit
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- final def synchronized[T0](arg0: => T0): T0
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- def toString(): String
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- final def wait(): Unit
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- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
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- final def wait(arg0: Long): Unit
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