trait Semigroup[A] extends Serializable
A semigroup is any set A
with an associative operation (combine
).
Linear Supertypes
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Abstract Value Members
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abstract
def
combine(x: A, y: A): A
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)
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abstract
def
getClass(): Class[_]
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Concrete Value Members
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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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final
def
asInstanceOf[T0]: T0
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def
combineAllOption(as: TraversableOnce[A]): Option[A]
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
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def
combineN(a: A, n: Int): A
Return
a
combined with itselfn
times.Return
a
combined with itselfn
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
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def
equals(arg0: Any): Boolean
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def
hashCode(): Int
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final
def
isInstanceOf[T0]: Boolean
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def
repeatedCombineN(a: A, n: Int): A
Return
a
combined with itself more than once.Return
a
combined with itself more than once.- Attributes
- protected[this]
-
def
toString(): String
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