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 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.
A semigroup is any set
A
with an associative operation (combine
).