slices

README

slices

Generic operations on slices: map, reduce, split, and group by. Because writing for loops over and over is really boring.

Documentation

Index

• func GroupBy[K comparable, V any](src []V, keyFn func(V) K) map[K][]V
• func Map[A any, B any](src []A, mapper func(A) B) []B
• func MapErr[A any, B any](src []A, mapper func(A) (B, error)) ([]B, error)
• func Reduce[V any, R any](values []V, acc R, reducer func(val V, acc R) R) R
• func ReduceErr[V any, R any](values []V, acc R, reducer func(val V, acc R) (R, error)) (R, error)
• func Split[X any](src []X, partLen int) [][]X

Functions

func GroupBy

func GroupBy[K comparable, V any](src []V, keyFn func(V) K) map[K][]V

GroupBy indexes the given values by the result of the key function.

func Map

func Map[A any, B any](src []A, mapper func(A) B) []B

Map converts from one type to another.

func MapErr

func MapErr[A any, B any](src []A, mapper func(A) (B, error)) ([]B, error)

MapErr allows the conversion to fail for any value that returns an error.

func Reduce

func Reduce[V any, R any](values []V, acc R, reducer func(val V, acc R) R) R

Reduce a slice to a single value given an initial accumulator value.

func ReduceErr

func ReduceErr[V any, R any](values []V, acc R, reducer func(val V, acc R) (R, error)) (R, error)

ReduceErr allows the reduction to fail for any value that returns an error.

func Split

func Split[X any](src []X, partLen int) [][]X

Split given slice into equal sized parts. The last part may have an unequal length if the size of the source slice is not divisible by the required length without leaving a remainder.