Effective Function Signatures with Default and Rest Parameters in JavaScript

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code for to implement function Signatures with Default and Rest Parameters in JavaScript −

Example

 Live Demo

<!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;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>Function Signatures with Default and Rest Parameters</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to call the add() function with multiple parameters</h3>
<script>
   let BtnEle = document.querySelector(".Btn");
   let resEle = document.querySelector(".result");
   function add(a = 0, b = 0, ...param) {
      let total = 0;
      total += a + b;
      param.forEach((item) => {
         total += item;
      });
      return total;
   }
   BtnEle.addEventListener("click", (event) => {
      resEle.innerHTML =
      "The total sum = " + add(2, null, 22, 11, 33, 44, 55);
   });
</script>
</body>
</html>

Output

On clicking the ‘CLICK HERE’ button −

raja
Published on 18-Jul-2020 07:35:36
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