How to use undefined Property in JavaScript

This article describe about undefined Property in JavaScript.
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undefined Property in JavaScript

If variable has not assigned value then it is indicated by the undefined property.

Example

<!DOCTYPE html>

<html>

<body>

<script type="text/javascript">

    var a = "";

    var b;

    if (a == undefined) {

        document.write("a is undefined");

    }

    if (b == undefined) {

        document.write("b is undefined");

    }

</script>

</body>

</html>

Output

pic6.jpg

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