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JavaScript indexOf substring

In this section, we are going to find the location of substring using the JavaScript method indexOf(). When this method is called from the string object, it returns the index of the position where the specified string first occurs in a string. If the particular string is not found then it will return -1. You can see in the given code, we have used the string.indexOf(substring,0) method where the parameters substring is the specified string and 0 is the index that will allow to start the search for the specified substring.

Here is the code:

<html>
<h2>Use of indexOf() method</h2>
<script type="text/javascript">
var string = "Hello World";
var substring = "World";
var position= string.indexOf(substring,0);
document.write("<b>The substring " + substring + " is at position </b>" + position);
</script>
</html>

Output will be displayed as:

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JavaScript indexOf substring

JavaScript indexOf substring

JavaScript indexOf substring

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