Spread operator in function calls JavaScript

The spread syntax allows us to spread an array or any iterable to be expanded across zero or more arguments in a function call.

Following is the code for spread operator in function calls 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>Spread operator in function calls</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to use spread operator to pass parameters to add() function</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   function add(a, b, c, d) {
      return a + b + c + d;
   let arr = [1, 2, 3, 4];
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML = add(...arr);


On clicking the ‘CLICK HERE’ button −