trait EvalMonoid[A] extends Monoid[Eval[A]] with EvalSemigroup[A]
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Abstract Value Members
- implicit abstract def algebra: Monoid[A]
- Definition Classes
- EvalMonoid → EvalSemigroup
Concrete Value Members
- 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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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- 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 combineAll(as: IterableOnce[Eval[A]]): Eval[A]
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 = ""
- Definition Classes
- Monoid
- 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
- def combineN(a: Eval[A], n: Int): Eval[A]
Return
aappended to itselfntimes. - lazy val empty: Eval[A]
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
- Definition Classes
- EvalMonoid → Monoid
- final def eq(arg0: AnyRef): Boolean
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- def equals(arg0: AnyRef): Boolean
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- def finalize(): Unit
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- final def getClass(): Class[_ <: AnyRef]
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- @native()
- def hashCode(): Int
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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.
- Definition Classes
- Semigroup
- def isEmpty(a: Eval[A])(implicit ev: kernel.Eq[Eval[A]]): Boolean
Tests if
ais the identity.Tests if
ais the identity.Example:
scala> import cats.kernel.instances.string._ scala> Monoid[String].isEmpty("") res0: Boolean = true scala> Monoid[String].isEmpty("something") res1: Boolean = false
- Definition Classes
- Monoid
- final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
- final def ne(arg0: AnyRef): Boolean
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- final def notify(): Unit
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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
- protected[this]
- Definition Classes
- Semigroup
- def reverse: kernel.Monoid[Eval[A]]
return a semigroup that reverses the order so combine(a, b) == reverse.combine(b, a)
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
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- def toString(): String
- Definition Classes
- AnyRef → Any
- final def wait(): Unit
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- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
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- final def wait(arg0: Long): Unit
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