Node.js

function* generator() {
  yield "hello";
  yield "world";
}

let gen = generator();

while (true) {
  let { value, done } = gen.next();
  console.log(value, done);

  if (done) {
    break;
  }
}

// alternatively
for (let value of generator()) {
  console.log(value);
}

Output

hello false
world false
undefined true
hello
world

Go

package main

import "fmt"

func Generator() chan string {
	c := make(chan string)

	go func() {
		c <- "hello"
		c <- "world"

		close(c)
	}()

	return c
}

func GeneratorFunc() func() (string, bool) {
	s := []string{"hello", "world"}
	i := -1

	return func() (string, bool) {
		i++
		if i >= len(s) {
			return "", false
		}

		return s[i], true
	}
}

func main() {
	gen := Generator()
	for {
		value, more := <-gen
		fmt.Println(value, more)

		if !more {
			break
		}
	}

	// alternatively
	for value := range Generator() {
		fmt.Println(value)
	}

	// alternatively
	genfn := GeneratorFunc()
	for {
		value, more := genfn()
		fmt.Println(value, more)

		if !more {
			break
		}
	}
}

Output

hello true
world true
 false
hello
world
hello true
world true
 false