Explain Strict Comparison in JavaScript switch statement?

JavascriptWeb DevelopmentObject Oriented Programming

The JavaScript switch statement only uses strict comparison (===) and doesn’t converts type if matches are not found using strict comparison and will immediately execute the default statement.

Following is the code for strict comparison in JavaScript switch statement −

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;
   }
</style>
</head>
<body>
<h1>JavaScript Switch statement strict comparison</h1>
Enter day 1-7<input type="text" class="day" /><button class="Btn">
CHECK
</button>
<div style="color: green;" class="result"></div>
<h3>
Click on the above button to check if switch performs strict comparison or not
</h3>
<script>
   let dayVal = document.querySelector(".day");
   let resEle = document.querySelector(".result");
   document.querySelector(".Btn").addEventListener("click", () => {
      switch (dayVal.value) {
         case 1:
            resEle.innerHTML = "It's monday";
            break;
         case 2:
            resEle.innerHTML = "It's tuesday";
            break;
         case 3:
            resEle.innerHTML = "It's wednesday";
            break;
         case 4:
            resEle.innerHTML = "It's thursday";
            break;
         case 5:
            resEle.innerHTML = "It's friday";
            break;
         case 6:
            resEle.innerHTML = "It's saturday";
            break;
         case 7:
            resEle.innerHTML = "It's sunday";
            break;
         default:
            resEle.innerHTML = "Enter a value between 1 - 7";
            break;
      }
   });
</script>
</body>
</html>

Output

The above code will produce the following output −

On entering a number and clicking “CHECK” the default statement would be called every time due to switch always performing strict comparison −

raja
Published on 15-Jul-2020 14:00:56
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