Packages

final class OneAnd[F[_], A] extends AnyRef

A generalization of NonEmptyList to non-List things. For example, OneAnd[Vector, A] is a non-empty Vector of A.

Only head and tail are provided as direct methods, because there's little you can do with a OneAnd without knowing a bit about F. So useful functions are provided in the form of typeclass instances on OneAnd's companion; in combination with syntax extensions provided by scalaz.syntax, OneAnd has a large possible set of methods available by importing. For example, Applicative on this requires ApplicativePlus[F], and Traverse1 on this requires Traverse[F]. See the companion documentation for a complete list of instances.

Additionally, unlike λ[α => (α, F[α])], the behavior of typeclass operations on OneAnd should be preserved across the natural transformation to scalaz.NonEmptyList where one exists. That is it should "be like" a nonempty structure. For example, ap-ing two OneAnd[Vector, *]s or NonEmptyLists of lengths *a* and *b* yields a sequence of same type of length *a*×*b*, but two λ[α => (α, Vector[α])]s of length *c* and *d* ap to one of length 1+(*c*–1)×(*d*–1). For another example, point of the former two yield a one-element sequence, but point of the latter yields a two-element sequence.

Source
OneAnd.scala
Since

7.0.3

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  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(that: Any): Boolean
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_ <: AnyRef]
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  10. def hashCode(): Int
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  11. def head: A
  12. final def isInstanceOf[T0]: Boolean
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  13. final def ne(arg0: AnyRef): Boolean
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  16. final def synchronized[T0](arg0: => T0): T0
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  17. def tail: F[A]
  18. def toString(): String
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  19. final def wait(): Unit
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  20. final def wait(arg0: Long, arg1: Int): Unit
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  21. final def wait(arg0: Long): Unit
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