The yield* expression/keyword in JavaScript.

The yield* expression is used to refer to another generator or iterable object.

Following is the code to implement yield* expression/keyword in JavaScript −


 Live Demo

<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   .result {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
<h1>yield* keyword in JavaScript</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to iterate over test2 and see the value yielded</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   function* test() {
      yield 12;
      yield 24;
      yield 36;
   function* test2() {
      yield* test();
   let iterator = test2();
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML = + "<br>";
      resEle.innerHTML += + "<br>";
      resEle.innerHTML += + "<br>";


On clicking the ‘CLICK HERE’ button −