Hands-On High Performance with Go

Generators

Generators return the subsequent value in a sequence when a function is called. As you can see in the following code block, anonymous functions can be used to implement the generator iterator pattern in Go:

package main import "fmt" func incrementCounter() func() int {    initializedNumber := 0    return func() int {        initializedNumber++        return initializedNumber    }   } func main() {    n1 := incrementCounter()    fmt.Println("n1 increment counter #1: ", n1())    fmt.Println("n1 increment counter #2: ", n1())    n2 := incrementCounter()    fmt.Println("n2 increment counter #1: ", n2())    fmt.Println("n1 increment counter #3: ", n1())}

When incrementCounter() is called, the integer represented in the function is incremented. Being able to use anonymous functions ...