Hands-On High Performance with Go

Closures for nesting and deferring work

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 mainimport ( "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.