@implicitNotFound("Could not find an instance of UnorderedFoldable for ${F}") @typeclass trait UnorderedFoldable[F[_]] extends Serializable
UnorderedFoldable is like a Foldable for unordered containers.
UnorderedFoldable is like a Foldable for unordered containers.
- Companion
- object
trait Serializable
class Object
trait Matchable
class Any
trait Foldable[F]
trait Reducible[F]
trait NonEmptyTraverse[F]
trait Traverse[F]
trait UnorderedTraverse[F]
Value members
Abstract methods
Concrete methods
@noop
Count the number of elements in the structure that satisfy the given predicate.
Count the number of elements in the structure that satisfy the given predicate.
For example:
scala> import cats.implicits._
scala> val map1 = Map[Int, String]()
scala> val p1: String => Boolean = _.length > 0
scala> UnorderedFoldable[Map[Int, *]].count(map1)(p1)
res0: Long = 0
scala> val map2 = Map(1 -> "hello", 2 -> "world", 3 -> "!")
scala> val p2: String => Boolean = _.length > 1
scala> UnorderedFoldable[Map[Int, *]].count(map2)(p2)
res1: Long = 2
Check whether at least one element satisfies the predicate.
Check whether at least one element satisfies the predicate.
If there are no elements, the result is false.
Check whether all elements satisfy the predicate.
Check whether all elements satisfy the predicate.
If there are no elements, the result is true.
Returns true if there are no elements. Otherwise false.
Returns true if there are no elements. Otherwise false.