Closures are also often a good way to nest and defer work. In the following example, we can see a function closure that allows us to nest work:

package main
import (
 "fmt"
 "sort"
) 
 
func main() {
 input := []string{"foo", "bar", "baz"}
 var result []string
 // closure callback
 func() {
 result = append(input, "abc") // Append to the array
 result = append(result, "def") // Append to the array again
 sort.Sort(sort.StringSlice(result)) // Sort the larger array
 }() 
 fmt.Print(result)
}

In this example, we can see that we append to the string slice twice and sort the result. We will later see how we can nest an anonymous function in a goroutine to help improve performance.