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FlatMap

func FlatMap[T any, R any](slice []T, mapper func(value T, index int, slice []T) []R) []R

FlatMap receives a slice of type T, executes the passed in slice-mapper function for each element in the slice, and returns a flattened slice containing all the elements from all the mapped slices. The function is passed the current element, the current index and the slice itself as function arguments.

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package main

import (
    "github.com/Goldziher/go-utils/sliceutils"
)

func main() {
    items := []int{1, 2, 3, 4}

    flatMapped := sliceutils.FlatMap(items, func(value int, index int, slice []int) []int {
        return []int{value, value * 2}
    }) // []int{1, 2, 2, 4, 3, 6, 4, 8}
}