FromFoldr

trait FromFoldr[F[_]] extends Foldable[F]

Template trait to define Foldable in terms of foldr

Example:

new Foldable[Option] with Foldable.FromFoldr[Option] {
  def foldr[A, B](fa: Option[A], z: B)(f: (A) => (=> B) => B) = fa match {
    case Some(a) => f(a)(z)
    case None => z
  }
}

Source: Foldable.scala

Linear Supertypes

Foldable[F], FoldableParent[F], AnyRef, Any

Ordering

Alphabetic
By Inheritance

Inherited

FromFoldr
Foldable
FoldableParent
AnyRef
Any

Hide All
Show All

Visibility

Public
All

Type Members

trait FoldableLaw extends AnyRef
Definition Classes
Foldable

Abstract Value Members

abstract def foldRight[A, B](fa: F[A], z: => B)(f: (A, => B) => B): B
Right-associative fold of a structure.
Right-associative fold of a structure.
Definition Classes
Foldable

Concrete Value Members

final def !=(arg0: Any): Boolean
Definition Classes
AnyRef → Any
final def ##(): Int
Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean
Definition Classes
AnyRef → Any
def all[A](fa: F[A])(p: (A) => Boolean): Boolean
Whether all As in fa yield true from p.
Whether all As in fa yield true from p.
Definition Classes
Foldable
def allM[G[_], A](fa: F[A])(p: (A) => G[Boolean])(implicit G: Monad[G]): G[Boolean]
all with monadic traversal.
all with monadic traversal.
Definition Classes
Foldable
def any[A](fa: F[A])(p: (A) => Boolean): Boolean
Whether any As in fa yield true from p.
Whether any As in fa yield true from p.
Definition Classes
Foldable
def anyM[G[_], A](fa: F[A])(p: (A) => G[Boolean])(implicit G: Monad[G]): G[Boolean]
any with monadic traversal.
any with monadic traversal.
Definition Classes
Foldable
final def asInstanceOf[T0]: T0
Definition Classes
Any
def bicompose[G[_, _]](implicit arg0: Bifoldable[G]): Bifoldable[[α, β]F[G[α, β]]]
The composition of Foldable F and Bifoldable G, [x, y]F[G[x, y]], is a Bifoldable
The composition of Foldable F and Bifoldable G, [x, y]F[G[x, y]], is a Bifoldable
Definition Classes
Foldable
def clone(): AnyRef
Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.CloneNotSupportedException]) @native()
def collapse[X[_], A](x: F[A])(implicit A: ApplicativePlus[X]): X[A]
Definition Classes
Foldable
def compose[G[_]](implicit G0: Foldable[G]): Foldable[[α]F[G[α]]]
The composition of Foldables F and G, [x]F[G[x]], is a Foldable
The composition of Foldables F and G, [x]F[G[x]], is a Foldable
Definition Classes
Foldable
final def count[A](fa: F[A]): Int
Alias for length.
Alias for length.
Definition Classes
Foldable
def distinct[A](fa: F[A])(implicit A: Order[A]): IList[A]
O(n log n) complexity
O(n log n) complexity
Definition Classes
Foldable
def distinctBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Equal[B]): IList[A]
Definition Classes
FoldableParent
def distinctE[A](fa: F[A])(implicit A: Equal[A]): IList[A]
O(n²) complexity
O(n²) complexity
Definition Classes
Foldable
def element[A](fa: F[A], a: A)(implicit arg0: Equal[A]): Boolean
Whether a is an element of fa.
Whether a is an element of fa.
Definition Classes
Foldable
def empty[A](fa: F[A]): Boolean
Deforested alias for toStream(fa).isEmpty.
Deforested alias for toStream(fa).isEmpty.
Definition Classes
Foldable
final def eq(arg0: AnyRef): Boolean
Definition Classes
AnyRef
def equals(arg0: AnyRef): Boolean
Definition Classes
AnyRef → Any
def extrema[A](fa: F[A])(implicit arg0: Order[A]): Option[(A, A)]
The smallest and largest elements of fa or None if fa is empty
The smallest and largest elements of fa or None if fa is empty
Definition Classes
FoldableParent
def extremaBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[(A, A)]
The elements (amin, amax) of fa which yield the smallest and largest values of f(a), respectively, or None if fa is empty
The elements (amin, amax) of fa which yield the smallest and largest values of f(a), respectively, or None if fa is empty
Definition Classes
FoldableParent
def extremaOf[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[(B, B)]
The smallest and largest values of f(a) for each element a of fa , or None if fa is empty
The smallest and largest values of f(a) for each element a of fa , or None if fa is empty
Definition Classes
FoldableParent
def filterLength[A](fa: F[A])(f: (A) => Boolean): Int
Definition Classes
FoldableParent
def finalize(): Unit
Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.Throwable])
def findLeft[A](fa: F[A])(f: (A) => Boolean): Option[A]
Definition Classes
Foldable
final def findMapM[M[_], A, B](fa: F[A])(f: (A) => M[Option[B]])(implicit arg0: Monad[M]): M[Option[B]]
map elements in a Foldable with a monadic function and return the first element that is mapped successfully
map elements in a Foldable with a monadic function and return the first element that is mapped successfully
Definition Classes
Foldable
def findRight[A](fa: F[A])(f: (A) => Boolean): Option[A]
Definition Classes
Foldable
def fold[M](t: F[M])(implicit arg0: Monoid[M]): M
Combine the elements of a structure using a monoid.
Combine the elements of a structure using a monoid.
Definition Classes
Foldable
def fold1Opt[A](fa: F[A])(implicit arg0: Semigroup[A]): Option[A]
Like fold but returning None if the foldable is empty and Some otherwise
Like fold but returning None if the foldable is empty and Some otherwise
Definition Classes
FoldableParent
def foldLeft[A, B](fa: F[A], z: B)(f: (B, A) => B): B
Left-associative fold of a structure.
Left-associative fold of a structure.
Definition Classes
Foldable
def foldLeft1Opt[A](fa: F[A])(f: (A, A) => A): Option[A]
Definition Classes
Foldable
def foldLeftM[G[_], A, B](fa: F[A], z: B)(f: (B, A) => G[B])(implicit M: Monad[G]): G[B]
Left-associative, monadic fold of a structure.
Left-associative, monadic fold of a structure.
Definition Classes
Foldable
def foldMap[A, B](fa: F[A])(f: (A) => B)(implicit F: Monoid[B]): B
Map each element of the structure to a scalaz.Monoid, and combine the results.
Map each element of the structure to a scalaz.Monoid, and combine the results.
Definition Classes
FromFoldr → Foldable
def foldMap1Opt[A, B](fa: F[A])(f: (A) => B)(implicit F: Semigroup[B]): Option[B]
As foldMap but returning None if the foldable is empty and Some otherwise
As foldMap but returning None if the foldable is empty and Some otherwise
Definition Classes
Foldable
def foldMapLeft1Opt[A, B](fa: F[A])(z: (A) => B)(f: (B, A) => B): Option[B]
Definition Classes
Foldable
def foldMapM[G[_], A, B](fa: F[A])(f: (A) => G[B])(implicit B: Monoid[B], G: Monad[G]): G[B]
Specialization of foldRightM when B has a Monoid.
Specialization of foldRightM when B has a Monoid.
Definition Classes
Foldable
def foldMapRight1Opt[A, B](fa: F[A])(z: (A) => B)(f: (A, => B) => B): Option[B]
Definition Classes
Foldable
def foldRight1Opt[A](fa: F[A])(f: (A, => A) => A): Option[A]
Definition Classes
Foldable
def foldRightM[G[_], A, B](fa: F[A], z: => B)(f: (A, => B) => G[B])(implicit M: Monad[G]): G[B]
Right-associative, monadic fold of a structure.
Right-associative, monadic fold of a structure.
Definition Classes
Foldable
def foldableLaw: FoldableLaw
Definition Classes
Foldable
val foldableSyntax: FoldableSyntax[F]
Definition Classes
Foldable
final def foldl[A, B](fa: F[A], z: B)(f: (B) => (A) => B): B
Curried version of foldLeft
Curried version of foldLeft
Definition Classes
Foldable
def foldl1Opt[A](fa: F[A])(f: (A) => (A) => A): Option[A]
Definition Classes
Foldable
final def foldlM[G[_], A, B](fa: F[A], z: => B)(f: (B) => (A) => G[B])(implicit M: Monad[G]): G[B]
Curried version of foldLeftM
Curried version of foldLeftM
Definition Classes
Foldable
final def foldr[A, B](fa: F[A], z: => B)(f: (A) => (=> B) => B): B
Curried version of foldRight
Curried version of foldRight
Definition Classes
Foldable
def foldr1Opt[A](fa: F[A])(f: (A) => (=> A) => A): Option[A]
Definition Classes
Foldable
final def foldrM[G[_], A, B](fa: F[A], z: => B)(f: (A) => (=> B) => G[B])(implicit M: Monad[G]): G[B]
Curried version of foldRightM
Curried version of foldRightM
Definition Classes
Foldable
final def getClass(): Class[_ <: AnyRef]
Definition Classes
AnyRef → Any
Annotations
@native()
def hashCode(): Int
Definition Classes
AnyRef → Any
Annotations
@native()
def index[A](fa: F[A], i: Int): Option[A]
returns
the element at index i in a Some, or None if the given index falls outside of the range
Definition Classes
Foldable
def indexOr[A](fa: F[A], default: => A, i: Int): A
returns
the element at index i, or default if the given index falls outside of the range
Definition Classes
Foldable
def intercalate[A](fa: F[A], a: A)(implicit A: Monoid[A]): A
Insert an A between every A, yielding the sum.
Insert an A between every A, yielding the sum.
Definition Classes
Foldable
final def isInstanceOf[T0]: Boolean
Definition Classes
Any
def length[A](fa: F[A]): Int
Deforested alias for toStream(fa).size.
Deforested alias for toStream(fa).size.
Definition Classes
Foldable
def longDigits[A](fa: F[A])(implicit d: <:<[A, Digit]): Long
Definition Classes
Foldable
def maximum[A](fa: F[A])(implicit arg0: Order[A]): Option[A]
The greatest element of fa, or None if fa is empty.
The greatest element of fa, or None if fa is empty.
Definition Classes
Foldable
def maximumBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[A]
The element a of fa which yields the greatest value of f(a), or None if fa is empty.
The element a of fa which yields the greatest value of f(a), or None if fa is empty.
Definition Classes
Foldable
def maximumOf[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[B]
The greatest value of f(a) for each element a of fa, or None if fa is empty.
The greatest value of f(a) for each element a of fa, or None if fa is empty.
Definition Classes
Foldable
def minimum[A](fa: F[A])(implicit arg0: Order[A]): Option[A]
The smallest element of fa, or None if fa is empty.
The smallest element of fa, or None if fa is empty.
Definition Classes
Foldable
def minimumBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[A]
The element a of fa which yields the smallest value of f(a), or None if fa is empty.
The element a of fa which yields the smallest value of f(a), or None if fa is empty.
Definition Classes
Foldable
def minimumOf[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Order[B]): Option[B]
The smallest value of f(a) for each element a of fa, or None if fa is empty.
The smallest value of f(a) for each element a of fa, or None if fa is empty.
Definition Classes
Foldable
def msuml[G[_], A](fa: F[G[A]])(implicit G: PlusEmpty[G]): G[A]
Definition Classes
Foldable
def msumlU[GA](fa: F[GA])(implicit G: Unapply[PlusEmpty, GA]): M[A]
Definition Classes
FoldableParent
final def ne(arg0: AnyRef): Boolean
Definition Classes
AnyRef
final def notify(): Unit
Definition Classes
AnyRef
Annotations
@native()
final def notifyAll(): Unit
Definition Classes
AnyRef
Annotations
@native()
def product[G[_]](implicit G0: Foldable[G]): Foldable[[α](F[α], G[α])]
The product of Foldables F and G, [x](F[x], G[x]]), is a Foldable
The product of Foldables F and G, [x](F[x], G[x]]), is a Foldable
Definition Classes
Foldable
def product0[G[_]](implicit G0: Foldable1[G]): Foldable1[[α](F[α], G[α])]
The product of Foldable F and Foldable1 G, [x](F[x], G[x]]), is a Foldable1
The product of Foldable F and Foldable1 G, [x](F[x], G[x]]), is a Foldable1
Definition Classes
Foldable
def selectSplit[A](fa: F[A])(p: (A) => Boolean): List[NonEmptyList[A]]
Selects groups of elements that satisfy p and discards others.
Selects groups of elements that satisfy p and discards others.
Definition Classes
Foldable
def sequenceF_[M[_], A](ffa: F[Free[M, A]]): Free[M, Unit]
sequence_ for Free.
sequence_ for Free. collapses into a single Free *
Definition Classes
Foldable
def sequenceS_[S, A](fga: F[State[S, A]]): State[S, Unit]
sequence_ specialized to State *
sequence_ specialized to State *
Definition Classes
Foldable
def sequence_[M[_], A](fa: F[M[A]])(implicit a: Applicative[M]): M[Unit]
Strict sequencing in an applicative functor M that ignores the value in fa.
Strict sequencing in an applicative functor M that ignores the value in fa.
Definition Classes
Foldable
def splitBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Equal[B]): IList[(B, NonEmptyList[A])]
Splits the elements into groups that produce the same result by a function f.
Splits the elements into groups that produce the same result by a function f.
Definition Classes
FoldableParent
def splitByRelation[A](fa: F[A])(r: (A, A) => Boolean): IList[NonEmptyList[A]]
Splits into groups of elements that are transitively dependant by a relation r.
Splits into groups of elements that are transitively dependant by a relation r.
Definition Classes
FoldableParent
def splitWith[A](fa: F[A])(p: (A) => Boolean): List[NonEmptyList[A]]
Splits the elements into groups that alternatively satisfy and don't satisfy the predicate p.
Splits the elements into groups that alternatively satisfy and don't satisfy the predicate p.
Definition Classes
Foldable
def suml[A](fa: F[A])(implicit A: Monoid[A]): A
Definition Classes
Foldable
def suml1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
Definition Classes
Foldable
def sumr[A](fa: F[A])(implicit A: Monoid[A]): A
Definition Classes
Foldable
def sumr1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
Definition Classes
Foldable
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
def toEphemeralStream[A](fa: F[A]): EphemeralStream[A]
Definition Classes
Foldable
def toIList[A](fa: F[A]): IList[A]
Definition Classes
Foldable
def toList[A](fa: F[A]): List[A]
Definition Classes
Foldable
def toSet[A](fa: F[A]): Set[A]
Definition Classes
Foldable
def toStream[A](fa: F[A]): Stream[A]
Definition Classes
Foldable
def toString(): String
Definition Classes
AnyRef → Any
def toVector[A](fa: F[A]): Vector[A]
Definition Classes
Foldable
def traverseS_[S, A, B](fa: F[A])(f: (A) => State[S, B]): State[S, Unit]
traverse_ specialized to State *
traverse_ specialized to State *
Definition Classes
Foldable
final def traverseU_[A, GB](fa: F[A])(f: (A) => GB)(implicit G: Unapply[Applicative, GB]): M[Unit]
A version of traverse_ that infers the type constructor M.
A version of traverse_ that infers the type constructor M.
Definition Classes
Foldable
def traverse_[M[_], A, B](fa: F[A])(f: (A) => M[B])(implicit a: Applicative[M]): M[Unit]
Strict traversal in an applicative functor M that ignores the result of f.
Strict traversal in an applicative functor M that ignores the result of f.
Definition Classes
Foldable
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()

Deprecated Value Members

def to[A, G[_]](fa: F[A])(implicit c: CanBuildFrom[Nothing, A, G[A]]): G[A]
Definition Classes
Foldable
Annotations
@deprecated
Deprecated
(Since version 7.2.22) removed in scalaz 7.3
Exceptions thrown
NoSuchMethodException if Scala 2.13 or later

Packages

FromFoldr

trait FromFoldr[F[_]] extends Foldable[F]

Type Members

Abstract Value Members

Concrete Value Members

Deprecated Value Members

Inherited from Foldable[F]

Inherited from FoldableParent[F]

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

FromFoldr

trait FromFoldr[F[_]] extends Foldable[F]

Type Members

Abstract Value Members

Concrete Value Members

Deprecated Value Members

Inherited from Foldable[F]

Inherited from FoldableParent[F]

Inherited from AnyRef

Inherited from Any

Ungrouped

FromFoldr