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trait TAFoldRight[F[_, _], G[_, _], Z, O] extends AnyRef

A type-aligned foldRight.

Eval is used as it is in cats.Foldable.foldRight to allow for lazy evaluation of the tail of the list and potential termination without traversing the entire structure.

F

the type of each element in the input structure. For example Function1.

G

the type to accumulate into. It has type parameters to support maintaining type-aligned properties in the accumulated object.

Z

the output type of the last element in the structure. Your TAFoldRight.init method will need to have an input type that lines up with the output type of the last element of the list, since the fold associates the last element with the initial accumulated result and then associates working back from there.

O

the output type of the final accumulated structure. Your TAFoldRight.init method will define what this needs to be.

Self Type
TAFoldRight[F, G, Z, O]
Source
TAFoldRight.scala
See also

TAList.foldRight for a foldRight across a TAList using an instance of this

TAFoldLeft for a foldLeft counterpart

TAReduceRight for a reduceRight (non-empty structure) counterpart

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Abstract Value Members

  1. abstract def init: Eval[G[Z, O]]

    Produce the initial accumulation value.

    Produce the initial accumulation value. Its input type must line up with the output type of the last element of the list, since the fold associates the last element with the initial accumulated result and then associates working back from there.

    returns

    the initial accumulation value

  2. abstract def step[L, P](f: F[L, P], g: Eval[G[P, O]]): Eval[G[L, O]]

    Update the accumulated result, given the previous element from the structure.

    Update the accumulated result, given the previous element from the structure.

    f

    the previous element in the structure

    returns

    an updated accumulated value

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  16. def toReduce: TAReduceRight[F, G, Z, O]
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