Programming for beginners: JavaScript: Working with boolean values

Friday 24 August 2018

JavaScript: Working with boolean values

Following values are considered as false.

a. undefined

b. Null

c. +0, −0, or NaN

d. Empty string

All other values, which are not mentioned above, are considered as true.

bool.html

<!DOCTYPE html>

<html>

<head>
    <title>true and false</title>
</head>

<body>
    <script type="text/javascript">
        var x = "";
        var y = "h";
        var z = 0;

        if (x) {
            document.write("x is true" + "<br />");
        } else {
            document.write("x is false" + "<br />");
        }

        if (y) {
            document.write("y is true" + "<br />");
        } else {
            document.write("y is false" + "<br />");
        }

        if (z) {
            document.write("z is true" + "<br />");
        } else {
            document.write("z is false" + "<br />");
        }
    </script>
</body>

</html>

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Friday 24 August 2018

JavaScript: Working with boolean values

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