JavaScript substring length

This section illustrates you how to determine the length of substring in JavaScript.

You can see in the given example, we have defined a string and used the JavaScript method substring() in order to extract the substring from the defined string. Now, we have used the JavaScript property length that allows to retrieve the length of the substring.

Here is the code:

<html>
<h2>Get the length of Substring</h2>
<script type="text/javascript">
var str = "Hello World";
var sub= str.substr(0,4);
document.writeln("The substring is :"+ sub+"<br>");
document.writeln("The length of the substring is :"+ sub.length);
</script>
</html>

Output will be displayed as:

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