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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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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. final def asum[G[_], A](fa: F[G[A]])(implicit G: PlusEmpty[G]): G[A]

    Alias for psum.

    Alias for psum. asum is the name used in Haskell.

    Definition Classes
    Foldable
  10. 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
  11. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  12. def collapse[X[_], A](x: F[A])(implicit A: ApplicativePlus[X]): X[A]
    Definition Classes
    Foldable
  13. 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

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

    Alias for length.

    Alias for length.

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

    O(n log n) complexity

  18. def distinctBy[A, B](fa: F[A])(f: (A) => B)(implicit arg0: Equal[B]): IList[A]
    Definition Classes
    Foldable
  19. def distinctE[A](fa: F[A])(implicit A: Equal[A]): IList[A]

    O(n2) complexity

    O(n2) complexity

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

    O(n2) complexity

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

    always return false

    always return false

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

    Left-associative fold of a structure.

  38. def foldLeft1Opt[A](fa: F[A])(f: (A, A) => A): Option[A]
    Definition Classes
    Foldable
  39. 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
  40. def foldLeftM1[G[_], A, B](fa: F[A])(z: (A) => B)(f: (B, A) => G[B])(implicit G: Monad[G]): G[B]
  41. 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
  42. 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
  43. def foldMapLeft1[A, B](fa: F[A])(z: (A) => B)(f: (B, A) => B): B

    Left-associative fold of a structure.

  44. def foldMapLeft1Opt[A, B](fa: F[A])(z: (A) => B)(f: (B, A) => B): Option[B]
    Definition Classes
    Foldable1Foldable
  45. 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
  46. def foldMapRight1Opt[A, B](fa: F[A])(z: (A) => B)(f: (A, => B) => B): Option[B]
    Definition Classes
    Foldable1Foldable
  47. 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
  48. def foldRight1[A](fa: F[A])(f: (A, => A) => A): A

    Right-associative fold of a structure.

  49. def foldRight1Opt[A](fa: F[A])(f: (A, => A) => A): Option[A]
    Definition Classes
    Foldable
  50. 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
  51. def foldRightM1[G[_], A, B](fa: F[A])(z: (A) => B)(f: (A, => B) => G[B])(implicit G: Monad[G]): G[B]
  52. def foldable1Law: Foldable1Law
  53. val foldable1Syntax: Foldable1Syntax[F]
  54. def foldableLaw: FoldableLaw
    Definition Classes
    Foldable
  55. val foldableSyntax: FoldableSyntax[F]
    Definition Classes
    Foldable
  56. 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
  57. final def foldl1[A](fa: F[A])(f: (A) => (A) => A): A

    Curried foldLeft1.

  58. def foldl1Opt[A](fa: F[A])(f: (A) => (A) => A): Option[A]
    Definition Classes
    Foldable1Foldable
  59. 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
  60. final def foldlM1[G[_], A, B](fa: F[A])(z: (A) => B)(f: (B) => (A) => G[B])(implicit arg0: Monad[G]): G[B]

    Curried version of foldLeftM1

  61. 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
  62. final def foldr1[A](fa: F[A])(f: (A) => (=> A) => A): A

    Curried foldRight1.

  63. def foldr1Opt[A](fa: F[A])(f: (A) => (=> A) => A): Option[A]
    Definition Classes
    Foldable1Foldable
  64. 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
  65. final def foldrM1[G[_], A, B](fa: F[A])(z: (A) => B)(f: (A) => (=> B) => G[B])(implicit arg0: Monad[G]): G[B]

    Curried version of foldRightM1

  66. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  67. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  68. 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
  69. 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
  70. 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
  71. def intercalate1[A](fa: F[A], a: A)(implicit A: Semigroup[A]): A

    Insert an A between every A, yielding the sum.

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

    Deforested alias for toStream(fa).size.

    Deforested alias for toStream(fa).size.

    Definition Classes
    Foldable
  74. def longDigits[A](fa: F[A])(implicit d: <:<[A, Digit]): Long
    Definition Classes
    Foldable
  75. 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
  76. def maximum1[A](fa: F[A])(implicit arg0: Order[A]): A

    The greatest element of fa.

  77. 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
  78. 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).

  79. 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
  80. 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.

  81. 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
  82. def minimum1[A](fa: F[A])(implicit arg0: Order[A]): A

    The smallest element of fa.

  83. 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
  84. 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).

  85. 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
  86. 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.

  87. def msuml1[G[_], A](fa: F[G[A]])(implicit G: Plus[G]): G[A]
  88. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  89. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  90. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  91. 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

  92. 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
  93. 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

  94. 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
  95. def psum[G[_], A](fa: F[G[A]])(implicit G: PlusEmpty[G]): G[A]

    Sum using a polymorphic monoid (PlusEmpty).

    Sum using a polymorphic monoid (PlusEmpty). Should support early termination, i.e. summing no more elements than is needed to determine the result.

    Definition Classes
    Foldable
  96. def psum1[G[_], A](fa: F[G[A]])(implicit G: Plus[G]): G[A]
  97. def psumMap[A, B, G[_]](fa: F[A])(f: (A) => G[B])(implicit G: PlusEmpty[G]): G[B]

    Map elements to G[B] and sum using a polymorphic monoid (PlusEmpty).

    Map elements to G[B] and sum using a polymorphic monoid (PlusEmpty). Should support early termination, i.e. mapping and summing no more elements than is needed to determine the result.

    Definition Classes
    Foldable
  98. def psumMap1[A, B, G[_]](fa: F[A])(f: (A) => G[B])(implicit G: Plus[G]): G[B]
  99. def scanLeft1[A](fa: F[A])(f: (A, A) => A): NonEmptyList[A]
  100. def scanRight1[A](fa: F[A])(f: (A, A) => A): NonEmptyList[A]
  101. 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
  102. def sequence1_[M[_], A](fa: F[M[A]])(implicit a: Apply[M], x: Semigroup[M[A]]): M[Unit]
  103. 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
  104. def sequenceS_[S, A](fga: F[State[S, A]]): State[S, Unit]

    sequence_ specialized to State *

    sequence_ specialized to State *

    Definition Classes
    Foldable
  105. 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
  106. 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
    Foldable
  107. 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
    Foldable
  108. 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
  109. def suml[A](fa: F[A])(implicit A: Monoid[A]): A
    Definition Classes
    Foldable
  110. def suml1[A](fa: F[A])(implicit A: Semigroup[A]): A
  111. def suml1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
    Definition Classes
    Foldable
  112. def sumr[A](fa: F[A])(implicit A: Monoid[A]): A
    Definition Classes
    Foldable
  113. def sumr1[A](fa: F[A])(implicit A: Semigroup[A]): A
  114. def sumr1Opt[A](fa: F[A])(implicit A: Semigroup[A]): Option[A]
    Definition Classes
    Foldable
  115. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  116. def toEphemeralStream[A](fa: F[A]): EphemeralStream[A]
    Definition Classes
    Foldable
  117. def toIList[A](fa: F[A]): IList[A]
    Definition Classes
    Foldable
  118. def toList[A](fa: F[A]): List[A]
    Definition Classes
    Foldable
  119. def toNel[A](fa: F[A]): NonEmptyList[A]
  120. def toSet[A](fa: F[A]): Set[A]
    Definition Classes
    Foldable
  121. def toStream[A](fa: F[A]): Stream[A]
    Definition Classes
    Foldable
  122. def toString(): String
    Definition Classes
    AnyRef → Any
  123. def toVector[A](fa: F[A]): Vector[A]
    Definition Classes
    Foldable
  124. def traverse1_[M[_], A, B](fa: F[A])(f: (A) => M[B])(implicit a: Apply[M], x: Semigroup[M[B]]): M[Unit]
  125. 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
  126. 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
  127. 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
  128. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  129. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  130. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Deprecated Value Members

  1. def msuml[G[_], A](fa: F[G[A]])(implicit G: PlusEmpty[G]): G[A]
    Definition Classes
    Foldable
    Annotations
    @deprecated
    Deprecated

    (Since version 7.3.0) use psum

  2. def msumlU[GA](fa: F[GA])(implicit G: Unapply[PlusEmpty, GA]): M[A]
    Definition Classes
    Foldable
    Annotations
    @deprecated
    Deprecated

    (Since version 7.3.0) use psum

Inherited from Foldable[F]

Inherited from AnyRef

Inherited from Any

Ungrouped