Packages

trait TAFoldLeft[F[_, _], G[_, _], Z, I] extends AnyRef

A type-aligned foldLeft.

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 input type of the first element in the structure. Your TAFoldLeft.init method will need to have an output type that lines up with the input type of the first element of the list, since the fold starts from the left.

I

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

Self Type
TAFoldLeft[F, G, Z, I]
Source
TAFoldLeft.scala
See also

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

TAFoldRight for a foldRight counterpart

TAReduceLeft for a reduceLeft (non-empty structure) counterpart

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Abstract Value Members

  1. abstract def init: G[I, Z]

    The initial accumulation value.

    The initial accumulation value. Since this will be consumed along with the the first element in the structure, its output type needs to line up with the input type of the first element.

  2. abstract def step[P, R](acc: G[I, P], f: F[P, R]): G[I, R]

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

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

    acc

    the current accumulated value

    f

    the next element in the structure

    returns

    an updated accumulated value

Concrete Value Members

  1. def toReduce: TAReduceLeft[F, G, Z, I]