CommutativeZeroMonoid represents a commutative zero monoid.
CommutativeZeroMonoid represents a commutative zero monoid.
A zero monoid is commutative if for all x and y, x |+| y === y |+| x.
- Companion
- object
Value members
Concrete methods
- Definition Classes
- CommutativeZeroSemigroup -> CommutativeMonoid -> CommutativeSemigroup -> ZeroMonoid -> ZeroSemigroup -> Monoid -> Semigroup
Inherited methods
Return the absorbing element for this zero semigroup.
Return the absorbing element for this zero semigroup.
- Inherited from
- ZeroSemigroup
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)
- Inherited from
- Semigroup
Given a sequence of as
, sum them using the monoid and return the total.
Given a sequence of as
, sum them using the monoid and return the total.
Example:
scala> import cats.kernel.instances.string._
scala> Monoid[String].combineAll(List("One ", "Two ", "Three"))
res0: String = One Two Three
scala> Monoid[String].combineAll(List.empty)
res1: String = ""
- Inherited from
- Monoid
Return a
appended to itself n
times.
Return a
appended to itself n
times.
Example:
scala> import cats.kernel.instances.string._
scala> Monoid[String].combineN("ha", 3)
res0: String = hahaha
scala> Monoid[String].combineN("ha", 0)
res1: String = ""
- Definition Classes
- Monoid -> Semigroup
- Inherited from
- Monoid
Return the identity element for this monoid.
Return the identity element for this monoid.
Example:
scala> import cats.kernel.instances.int._
scala> import cats.kernel.instances.string._
scala> Monoid[String].empty
res0: String = ""
scala> Monoid[Int].empty
res1: Int = 0
- Inherited from
- Monoid
Tests if a
is the absorbing element.
Tests if a
is the absorbing element.
- Inherited from
- ZeroSemigroup