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JavaScript String substr() Method with Example

JavaScript String substr() Method: Here, we are going to learn about the substr() method in JavaScript with Example.
Submitted by IncludeHelp, on February 06, 2019

String substr() Method

substr() method is a string method in JavaScript, it is used to extract a part of the string (substring) from the given string.

Syntax:

    String.substr(start, [length]);

Here,

String is the main string.
start is the initial index from where we have to extract the part of the string.
length is an optional parameter, it defines the total number of characters to be extracted from the given index.

Examples:

    str = "IncludeHelp is made for students.";
    start = 10
    length = None 
    Output:
    "p is made for students."

    Input:
    str = "IncludeHelp is made for students.";
    start = 0
    length = 11
    Output:
    "IncludeHelp"

Code:

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

<body>
<script>
	var str = "IncludeHelp is made for students.";
	var substring ="";
	
	substring = str.substr(10);
	document.write(substring + "<br>");

	substring = str.substr(0,11);
	document.write(substring + "<br>");	

	substring = str.substr(12,7);
	document.write(substring + "<br>");		
</script>
</body>
</html>

Output

p is made for students.
IncludeHelp
is made