Short Circuit Assignment in JavaScript

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code to implement short circuit assignment 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,
   .sample {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
   }
   .sample {
      color: red;
   }
</style>
</head>
<body>
<h1>Short-circuit assignment</h1>
<div class="sample">a=22 || 0 || 0<br />b=0 && 22 && 22</div>
<div class="result"></div>
<br />
<button class="Btn">Click Here</button>
<h3>Click on the above button to see the values of variable a and b in the above expression</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   BtnEle.addEventListener("click", () => {
      let a, b;
      a = 22 || 0 || 0;
      b = 0 && 22 && 22;
      resEle.innerHTML = "a = " + a + "<br>";
      resEle.innerHTML += "b = " + b + "<br>";
   });
</script>
</body>
</html>

Output

On clicking the “Click Here” button the expression will be evaluated. The thing to note here is that non-zero number evaluates to false.

raja
Published on 18-Jul-2020 11:39:12
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