De-structuring assignment in JavaScript.

De-structuring assignment is a form of special syntax allows us to destructure objects properties, or array values and later assign them to different variables.

Following is the code for the destructuring assignment 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;
   .sample,.result {
      font-size: 18px;
      font-weight: 500;
      color: red;
   .result {
      color: rebeccapurple;
<h1>De-structuring assignment in JavaScript</h1>
<div class="sample"></div>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to destructure the array and object above</h3>
   let sampleEle = document.querySelector(".sample");
   let resultEle = document.querySelector(".result");
   let arr = [2, 3, 4, 5];
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
   sampleEle.innerHTML = "arr = " + arr + "<br>";
   sampleEle.innerHTML += "obj = {firstName:'Rohan',lastName:'Sharma'}";
   let a, b;
   [a, b] = arr;
   let { firstName, lastName } = obj;
   document.querySelector(".Btn").addEventListener("click", () => {
      resultEle.innerHTML = `a=${a} b=${b} <br>`;
      resultEle.innerHTML += `firstName=${firstName} lastName=${lastName}`;


The above code will produce the following output −

On clicking the ‘CLICK HERE’ button −