trait EvalSemigroup[A] extends Semigroup[Eval[A]]
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- def combine(lx: Eval[A], ly: Eval[A]): Eval[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)
- Definition Classes
- EvalSemigroup → Semigroup
- def combineAllOption(as: IterableOnce[Eval[A]]): Option[Eval[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
- Definition Classes
- Semigroup
- def combineN(a: Eval[A], n: Int): Eval[A]
Return
acombined with itselfntimes.Return
acombined with itselfntimes.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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- Semigroup
- final def eq(arg0: AnyRef): Boolean
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- def intercalate(middle: Eval[A]): kernel.Semigroup[Eval[A]]
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.
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- Semigroup
- final def isInstanceOf[T0]: Boolean
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- final def ne(arg0: AnyRef): Boolean
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- final def notifyAll(): Unit
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- def repeatedCombineN(a: Eval[A], n: Int): Eval[A]
Return
acombined with itself more than once.Return
acombined with itself more than once.- Attributes
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- Semigroup
- def reverse: kernel.Semigroup[Eval[A]]
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)
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- Semigroup
- final def synchronized[T0](arg0: => T0): T0
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- final def wait(): Unit
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