Creating JavaScript Constructor Using the New Operator

Javascript Web Development Object Oriented Programming

Following is the code for creating a JavaScript constructor using the ‘new’ operator −

Example

<!DOCTYPE html>
<html lang="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: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript constructor using new</h1>
<div style="color: green;" class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to create JavaScript constructor using new operator</h3>
<script>
   let resEle = document.querySelector(".result");
   function Human(firstName,lastName,age){
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
   }
   let obj = new Human('Rohan','Sharma',22);
   document.querySelector(".Btn").addEventListener("click", () => {
      for(i in obj){
         resEle.innerHTML += 'Key = ' + i + ' : Value = ' + obj[i] + '<br>'
      }
   });
</script>
</body>
</html>