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Solution Review: Inserting Slice in a Slice

Understand how to insert one slice into another at any given position in Go by using the copy function. Explore a step-by-step code solution that creates a new slice, copies elements before and after the insertion point, and returns the updated slice. This lesson helps you master slice manipulation for more dynamic Go programming.

We'll cover the following...
Go (1.6.2)
package main
import (
	"fmt"
)
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]
	fmt.Println(res)
}
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
}

In the code above, look at the header for the function insertSlice at line 15: insertSlice(slice, insertion []string, index int) []string. This function takes two slices slice (the slice in which another slice will be inserted) and insertion (the slice that is to be inserted in slice) and an integer parameter index that defines the point of insertion. The function returns an updated slice after insertion.

We make a slice called result at line 16 with the make function. The length of the ...