aggregate

func All ¶

func All[T any](source iterator.Iterator[T], predicate func(T) bool) bool

func Any ¶

func Any[T any](source iterator.Iterator[T], predicate func(T) bool) bool

func Fold ¶

func Fold[T, U any](it iterator.Iterator[T], initial U, fn func(U, T) U) U

Fold applies a function to each element of the iterator, threading an accumulator argument through the computation.

s := source.Slice([]int{1, 2, 3})
it := Fold[int, []int](s, []int{}, func(acc []int, x int) []int { return prependInt(acc, x) })
fmt.Println(it)

Output:

[3 2 1]

func Product ¶

func Product[T Number](it iterator.Iterator[T]) T

Product returns the product of all elements in the iterator.

func Reduce ¶

func Reduce[T any](it iterator.Iterator[T], fn func(T, T) T) T

Reduce applies a function to each element of the iterator, threading an accumulator argument through the computation. The first element of the iterator is used as the initial value of the accumulator. If the iterator is empty, Reduce panics.

func Sum ¶

func Sum[T Number](it iterator.Iterator[T]) T

Sum returns the sum of all elements in the iterator.