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Javascript String - substr() Method


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Description:

This method returns the characters in a string beginning at the specified location through the specified number of characters.

Syntax:

string.substr(start[, length]);

Here is the detail of parameters:

  • start : Location at which to begin extracting characters (an integer between 0 and one less than the length of the string).

  • length : The number of characters to extract.

Note: If start is negative, substr uses it as a character index from the end of the string.

Return Value:

  • The substr method returns the new sub string based on given parameters.

Example:

<html>
<head>
<title>JavaScript String substr() Method</title>
</head>
<body>
<script type="text/javascript">

var str = "Apples are round, and apples are juicy.";

document.write("(1,2): "    + str.substr(1,2));
document.write("<br />(-2,2): "   + str.substr(-2,2));
document.write("<br />(1): "      + str.substr(1));
document.write("<br />(-20, 2): " + str.substr(-20,2));
document.write("<br />(20, 2): "  + str.substr(20,2));

</script>
</body>
</html>

This will produce following result:

(1,2): pp
(-2,2): Ap
(1): pples are round, and apples are juicy.
(-20, 2): Ap
(20, 2): d  

To understand it in better way you can Try it yourself.



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