Solution Review: Inserting Slice in a Slice

This lesson discusses the solution to the challenge given in the previous lesson.

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package main
import (
func main() {
s := []string{"M", "N", "O", "P", "Q", "R"}
in := []string{"A", "B", "C"}
res := insertSlice(s, in, 0) // at the front
fmt.Println(res) // [A B C M N O P Q R]
res = insertSlice(s, in, 3) // [M N O A B C P Q R]
func insertSlice(slice, insertion []string, index int) []string {
result := make([]string, len(slice) + len(insertion))
at := copy(result, slice[:index])
at += copy(result[at:], insertion)
copy(result[at:], slice[index:])
return result

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