isNaN-2

In this example, We will see isNaN with blank value. In JavaScript, isNaN("") will return false because JavaScript treat blank string as 0(zero) and "" == 0 will return true. so that is why IsNaN("") will return false.

<!DOCTYPE html>
<html>
<head>
<title>Welcome to LearnKode - A code learning platform</title>
     
</head>
<body>
<p>The isNaN() function returns true if the value is NaN (Not-a-Number), and false if not.</p>
<button onclick="checkNumber()">Check the value</button>
<p id="sample"></p>
<script>
function checkNumber() {
    var a = isNaN("37") + "<br>";
    var b = isNaN("37.37") + "<br>";
    var c = isNaN("") + "<br>";
    var d = isNaN(" ") + "<br>";
      
    numbers=a+b+c+d;
    document.getElementById("sample").innerHTML = numbers;
}
</script>

</body>
</html>

Output