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Difference between indexOf() and search() methods in JavaScript

JavaScript indexOf() and search() methods difference: Here, we are going to learn about the difference between indexOf() and search() methods in JavaScript.
Submitted by IncludeHelp, on February 02, 2019

Prerequisite:

Though indexOf() and search() both methods are used to check whether a substring exists in the string or not and returns either of the index of the substring or -1 (if substring does not exist in the string), there is a difference between indexOf() and search() methods. Consider the syntaxes of both methods:

Syntax of indexOf() method:

    String.indexOf(substring, [offset]);

Syntax of search() method:

    String.search(substring);

Now, you can clearly see that in indexOf() method, there is an optional parameter(offset) from where we can start the searching but the method search() does not have this feature. It simply takes the substring and starts searching from the 0th index.

Example:

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
<script>		
var str = "friends say Hello";

var substr = "Hello";		
var index = str.indexOf(substr);
if(index!=-1)
	document.write(substr + " found at " + index + " position.<br>");
else
	document.write(substr + " does not exist in the " + str + ".<br>");

var substr = "Hello";		
var index = str.search(substr);
if(index!=-1)
	document.write(substr + " found at " + index + " position.<br>");
else
	document.write(substr + " does not exist in the " + str + ".<br>");

substr = "Hi";
index = str.indexOf(substr);		
if(index!=-1)
	document.write(substr + " found at " + index + " position.<br>");
else
	document.write(substr + " does not exist in the " + str + ".<br>");

substr = "Hi";
index = str.search(substr);		
if(index!=-1)
	document.write(substr + " found at " + index + " position.<br>");
else
	document.write(substr + " does not exist in the " + str + ".<br>");
</script>
</body>
</html>

Output

Hello found at 12 position.
Hello found at 12 position.
Hi does not exist in the friends say Hello.
Hi does not exist in the friends say Hello.




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