given_CommutativeGroup_Coin
Attributes
- Graph
-
- Supertypes
- Self type
Members list
Value members
Concrete methods
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)
Attributes
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
Attributes
Inherited methods
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 = ""
Attributes
- Inherited from:
- Monoid
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
Attributes
- Definition Classes
-
Monoid -> Semigroup
- Inherited from:
- Monoid
Return a appended to itself n times. If n is negative, then this returns inverse(a) appended to itself n times.
Return a appended to itself n times. If n is negative, then this returns inverse(a) appended to itself n times.
Attributes
- Definition Classes
-
Group -> Monoid -> Semigroup
- Inherited from:
- Group
Between each pair of elements insert middle This name matches the term used in Foldable and Reducible and a similar Haskell function.
Between each pair of elements insert middle This name matches the term used in Foldable and Reducible and a similar Haskell function.
Attributes
- Definition Classes
-
CommutativeSemigroup -> Semigroup
- Inherited from:
- CommutativeSemigroup
Tests if a is the identity.
Tests if a is the identity.
Example:
scala> import cats.kernel.instances.string._
scala> Monoid[String].isEmpty("")
res0: Boolean = true
scala> Monoid[String].isEmpty("something")
res1: Boolean = false
Attributes
- Inherited from:
- Monoid
Remove the element b from a.
Remove the element b from a.
Equivalent to combine(a, inverse(b))
Example:
scala> import cats.kernel.instances.int._
scala> Group[Int].remove(5, 2)
res0: Int = 3
Attributes
- Inherited from:
- Group
return a semigroup that reverses the order so combine(a, b) == reverse.combine(b, a)
return a semigroup that reverses the order so combine(a, b) == reverse.combine(b, a)
Attributes
- Definition Classes
-
CommutativeMonoid -> CommutativeSemigroup -> Monoid -> Semigroup
- Inherited from:
- CommutativeMonoid