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trait Foldable1[F[_]] extends Foldable[F]

A scalaz.Foldable where foldMap is total over semigroups. That is, toList cannot return an empty list.

Self Type
Foldable1[F]
Source
Foldable1.scala
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  1. Foldable1
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Type Members

  1. trait FoldableLaw extends AnyRef
    Definition Classes
    Foldable
  2. trait Foldable1Law extends FoldableLaw

Abstract Value Members

  1. abstract def foldMap1[A, B](fa: F[A])(f: (A) ⇒ B)(implicit F: Semigroup[B]): B

    Map each element of the structure to a scalaz.Semigroup, and combine the results.

  2. abstract def foldMapRight1[A, B](fa: F[A])(z: (A) ⇒ B)(f: (A, ⇒ B) ⇒ B): B

    Right-associative fold of a structure.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. 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
  5. 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
  6. 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
  7. 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
  8. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  9. 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
  10. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  11. def collapse[X[_], A](x: F[A])(implicit A: ApplicativePlus[X]): X[A]
    Definition Classes
    Foldable
  12. def compose[G[_]](implicit arg0: Foldable1[G]): Foldable1[[α]F[G[α]]]

    The composition of Foldable1 F and G, [x]F[G[x]], is a Foldable1

  13. 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
  14. final def count[A](fa: F[A]): Int

    Alias for length.

    Alias for length.

    Definition Classes
    Foldable
  15. 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
  16. def distinct1[A](fa: F[A])(implicit A: Order[A]): NonEmptyList[A]

    O(n log n) complexity

  17. def distinctBy[A, B](fa: F[A])(f: (A) ⇒ B)(implicit arg0: Equal[B]): IList[A]
    Definition Classes
    FoldableParent
  18. def distinctE[A](fa: F[A])(implicit A: Equal[A]): IList[A]

    O(n2) complexity

    O(n2) complexity

    Definition Classes
    Foldable
  19. def distinctE1[A](fa: F[A])(implicit A: Equal[A]): NonEmptyList[A]

    O(n2) complexity

  20. 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
  21. final def empty[A](fa: F[A]): Boolean

    always return false

    always return false

    Definition Classes
    Foldable1Foldable
  22. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  23. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  24. 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
  25. 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
  26. 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
  27. def filterLength[A](fa: F[A])(f: (A) ⇒ Boolean): Int
    Definition Classes
    FoldableParent
  28. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  29. def findLeft[A](fa: F[A])(f: (A) ⇒ Boolean): Option[A]
    Definition Classes
    Foldable
  30. 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
  31. def findRight[A](fa: F[A])(f: (A) ⇒ Boolean): Option[A]
    Definition Classes
    Foldable
  32. 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
  33. def fold1[M](t: F[M])(implicit arg0: Semigroup[M]): M
  34. 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
  35. 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
  36. def foldLeft1[A](fa: F[A])(f: (A, A) ⇒ A): A

    Left-associative fold of a structure.

  37. def foldLeft1Opt[A](fa: F[A])(f: (A, A) ⇒ A): Option[A]
    Definition Classes
    Foldable
  38. 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
  39. 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
    Foldable1Foldable
  40. 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
    Foldable1Foldable
  41. def foldMapLeft1[A, B](fa: F[A])(z: (A) ⇒ B)(f: (B, A) ⇒ B): B

    Left-associative fold of a structure.

  42. def foldMapLeft1Opt[A, B](fa: F[A])(z: (A) ⇒ B)(f: (B, A) ⇒ B): Option[B]
    Definition Classes
    Foldable1Foldable
  43. 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
  44. def foldMapRight1Opt[A, B](fa: F[A])(z: (A) ⇒ B)(f: (A, ⇒ B) ⇒ B): Option[B]
    Definition Classes
    Foldable1Foldable
  45. 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
    Foldable1Foldable
  46. def foldRight1[A](fa: F[A])(f: (A, ⇒ A) ⇒ A): A

    Right-associative fold of a structure.

  47. def foldRight1Opt[A](fa: F[A])(f: (A, ⇒ A) ⇒ A): Option[A]
    Definition Classes
    Foldable
  48. 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
  49. def foldable1Law: Foldable1Law
  50. val foldable1Syntax: Foldable1Syntax[F]
  51. def foldableLaw: FoldableLaw
    Definition Classes
    Foldable
  52. val foldableSyntax: FoldableSyntax[F]
    Definition Classes
    Foldable
  53. 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
  54. final def foldl1[A](fa: F[A])(f: (A) ⇒ (A) ⇒ A): A

    Curried foldLeft1.

  55. def foldl1Opt[A](fa: F[A])(f: (A) ⇒ (A) ⇒ A): Option[A]
    Definition Classes
    Foldable1Foldable
  56. 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
  57. 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
  58. final def foldr1[A](fa: F[A])(f: (A) ⇒ (⇒ A) ⇒ A): A

    Curried foldRight1.

  59. def foldr1Opt[A](fa: F[A])(f: (A) ⇒ (⇒ A) ⇒ A): Option[A]
    Definition Classes
    Foldable1Foldable
  60. 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
  61. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  62. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  63. 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
  64. 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
  65. def intercalate[A](fa: F[A], a: A)(implicit arg0: Monoid[A]): A

    Insert an A between every A, yielding the sum.

    Insert an A between every A, yielding the sum.

    Definition Classes
    Foldable1Foldable
  66. def intercalate1[A](fa: F[A], a: A)(implicit A: Semigroup[A]): A

    Insert an A between every A, yielding the sum.

  67. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  68. def length[A](fa: F[A]): Int

    Deforested alias for toStream(fa).size.

    Deforested alias for toStream(fa).size.

    Definition Classes
    Foldable
  69. def longDigits[A](fa: F[A])(implicit d: <:<[A, Digit]): Long
    Definition Classes
    Foldable
  70. 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
    Foldable1Foldable
  71. def maximum1[A](fa: F[A])(implicit arg0: Order[A]): A

    The greatest element of fa.

  72. 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
    Foldable1Foldable
  73. def maximumBy1[A, B](fa: F[A])(f: (A) ⇒ B)(implicit arg0: Order[B]): A

    The element a of fa which yield the greatest value of f(a).

  74. 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
    Foldable1Foldable
  75. def maximumOf1[A, B](fa: F[A])(f: (A) ⇒ B)(implicit arg0: Order[B]): B

    The greatest value of f(a) for each element a of fa.

  76. 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
    Foldable1Foldable
  77. def minimum1[A](fa: F[A])(implicit arg0: Order[A]): A

    The smallest element of fa.

  78. 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
    Foldable1Foldable
  79. def minimumBy1[A, B](fa: F[A])(f: (A) ⇒ B)(implicit arg0: Order[B]): A

    The element a of fa which yield the smallest value of f(a).

  80. 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
    Foldable1Foldable
  81. def minimumOf1[A, B](fa: F[A])(f: (A) ⇒ B)(implicit arg0: Order[B]): B

    The smallest value of f(a) for each element a of fa.

  82. def msuml[G[_], A](fa: F[G[A]])(implicit G: PlusEmpty[G]): G[A]
    Definition Classes
    Foldable
  83. def msuml1[G[_], A](fa: F[G[A]])(implicit G: Plus[G]): G[A]
  84. def msumlU[GA](fa: F[GA])(implicit G: Unapply[PlusEmpty, GA]): M[A]
    Definition Classes
    FoldableParent
  85. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  86. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  87. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  88. def product[G[_]](implicit G0: Foldable1[G]): Foldable1[[α](F[α], G[α])]

    The product of Foldable1 F and G, [x](F[x], G[x]]), is a Foldable1

  89. 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
  90. def product0[G[_]](implicit G0: Foldable[G]): Foldable1[[α](F[α], G[α])]

    The product of Foldable1 F and Foldable G, [x](F[x], G[x]]), is a Foldable1

  91. 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
  92. def scanLeft1[A](fa: F[A])(f: (A, A) ⇒ A): NonEmptyList[A]
  93. def scanRight1[A](fa: F[A])(f: (A, A) ⇒ A): NonEmptyList[A]
  94. 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
  95. def sequence1_[M[_], A](fa: F[M[A]])(implicit a: Apply[M], x: Semigroup[M[A]]): M[Unit]
  96. 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
  97. def sequenceS_[S, A](fga: F[State[S, A]]): State[S, Unit]

    sequence_ specialized to State *

    sequence_ specialized to State *

    Definition Classes
    Foldable
  98. 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
  99. 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
  100. 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
  101. 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
  102. def suml[A](fa: F[A])(implicit A: Monoid[A]): A
    Definition Classes
    Foldable
  103. def suml1[A](fa: F[A])(implicit A: Semigroup[A]): A
  104. def suml1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
    Definition Classes
    Foldable
  105. def sumr[A](fa: F[A])(implicit A: Monoid[A]): A
    Definition Classes
    Foldable
  106. def sumr1[A](fa: F[A])(implicit A: Semigroup[A]): A
  107. def sumr1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
    Definition Classes
    Foldable
  108. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  109. def toEphemeralStream[A](fa: F[A]): EphemeralStream[A]
    Definition Classes
    Foldable
  110. def toIList[A](fa: F[A]): IList[A]
    Definition Classes
    Foldable
  111. def toList[A](fa: F[A]): List[A]
    Definition Classes
    Foldable
  112. def toNel[A](fa: F[A]): NonEmptyList[A]
  113. def toSet[A](fa: F[A]): Set[A]
    Definition Classes
    Foldable
  114. def toStream[A](fa: F[A]): Stream[A]
    Definition Classes
    Foldable
  115. def toString(): String
    Definition Classes
    AnyRef → Any
  116. def toVector[A](fa: F[A]): Vector[A]
    Definition Classes
    Foldable
  117. def traverse1_[M[_], A, B](fa: F[A])(f: (A) ⇒ M[B])(implicit a: Apply[M], x: Semigroup[M[B]]): M[Unit]
  118. 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
  119. 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
  120. 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
  121. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  122. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  123. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Deprecated Value Members

  1. 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

Inherited from Foldable[F]

Inherited from FoldableParent[F]

Inherited from AnyRef

Inherited from Any

Ungrouped