mapper

Documentation

Index

• func FlatMap[E any, T any](from []E, fn func(fromEntry E) []T) []T
• func Map[E any, T any](from []E, fn func(fromEntry E) T) []T
• func MapWithErr[E any, T any](from []E, fn func(fromEntry E) (T, error)) ([]T, error)
• func MergeMaps[K comparable, V any](m1 map[K]V, m2 map[K]V) map[K]V
• func Reduce[E any, T any](from []E, initial T, fn func(accumulator T, current E) T) T

Functions

func FlatMap

func FlatMap[E any, T any](from []E, fn func(fromEntry E) []T) []T

FlatMap can be used to convert any list from MemberType E to T. It takes a list of E (E can also be a *E) and a function that is used for each element of E to []T. Instead of returning [][]T, the resulting list gets flattened to []T. Mapping: [[-][-][-]] [[-][-][-]] -> [+][+][+][+][+][+]

func Map

func Map[E any, T any](from []E, fn func(fromEntry E) T) []T

Map can be used to convert any list from MemberType E to T. It takes a list of E (E can also be a *E) and a function that is used for each element of E to T. It returns a []T after all.

Mapping: [-][-][-] -> [+][+][+]

func MapWithErr

func MapWithErr[E any, T any](from []E, fn func(fromEntry E) (T, error)) ([]T, error)

MapWithErr behaves like PointerMap, but stops mapping when fn returns an error. The first error that occurs is returned.

func MergeMaps

func MergeMaps[K comparable, V any](m1 map[K]V, m2 map[K]V) map[K]V

MergeMaps merges two maps of same key and value types together. The second map m2 takes precedence in case of overlapping keys.

func Reduce

func Reduce[E any, T any](from []E, initial T, fn func(accumulator T, current E) T) T

Reduce converts any list of type E into one element of type T. The reducer function fn is called for each element of the from slice and an accumulated value of type T, starting with initial.