Explain Deep cloning an object in JavaScript with an example.

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code for deep cloning an object in JavaScript −

Example

 Live Demo

<!DOCTYPE html>
<htmllang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
   }
</style>
</head>
<body>
<h1>Deep cloning an object in javascript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click the above button to deep clone the obj object</h3>
<script>
   let BtnEle = document.querySelector(".Btn");
   let resEle = document.querySelector(".result");
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
      age: 22,
      rollNo: "A12",
   };
   let obj1 = JSON.parse(JSON.stringify(obj));
   BtnEle.addEventListener("click", () => {
      obj.firstName = "Mohit";
      resEle.innerHTML = "obj.firstName =" + obj.firstName + "<br>";
      resEle.innerHTML += "obj1.firstName = " + obj1.firstName + "<br><br>";
   });
</script>
</body>
</html>

Output

The above code will produce the following output −

On clicking the ‘CLICK HERE’ button −

raja
Published on 18-Jul-2020 08:41:18
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