Semilattice
Related Docs:
object Semilattice
| package kernel
Associative operation which combines two values.
Associative operation which combines two values.
Example:
scala> import cats.kernel.instances.string._ scala> import cats.kernel.instances.int._ scala> import cats.kernel.instances.option._ scala> Semigroup[String].combine("Hello ", "World!") res0: String = Hello World! scala> Semigroup[Option[Int]].combine(None, Some(1)) res1: Option[Int] = Some(1)
Given Eq[A], return a PartialOrder[A] using the combine
operator to determine the partial ordering.
Given Eq[A], return a PartialOrder[A] using the combine
operator to determine the partial ordering. This method assumes
combine functions as join (that is, as an upper bound).
This method returns:
0.0 if x = y -1.0 if y = combine(x, y) 1.0 if x = combine(x, y) NaN otherwise
Given Eq[A], return a PartialOrder[A] using the combine
operator to determine the partial ordering.
Given Eq[A], return a PartialOrder[A] using the combine
operator to determine the partial ordering. This method assumes
combine functions as meet (that is, as a lower bound).
This method returns:
0.0 if x = y -1.0 if x = combine(x, y) 1.0 if y = combine(x, y) NaN otherwise
Given a sequence of as, combine them and return the total.
Given a sequence of as, combine them and return the total.
If the sequence is empty, returns None. Otherwise, returns Some(total).
Example:
scala> import cats.kernel.instances.string._ scala> Semigroup[String].combineAllOption(List("One ", "Two ", "Three")) res0: Option[String] = Some(One Two Three) scala> Semigroup[String].combineAllOption(List.empty) res1: Option[String] = None
Return a combined with itself n times.
Return a combined with itself n times.
Example:
scala> import cats.kernel.instances.int._ scala> import cats.kernel.instances.string._ scala> Semigroup[Int].combineN(1, 10) res0: Int = 10 scala> Semigroup[String].combineN("ha", 3) res1: String = hahaha
Return a combined with itself more than once.
Return a combined with itself more than once.
Semilattices are commutative semigroups whose operation (i.e. combine) is also idempotent.