Javascript String Methods with Usage examples

A JavaScript string stores a series of characters like "John Doe".

A string can be any text inside double or single quotes:

<html>

<head>

<title>String functions in javascript</title>

document.write("<h1 align='center'><font color='blue'>String Functions</font></h1><hr/>");

var str = "This is sample string";

document.write("<h2>Length of string</h2>");

document.write(str.length);

document.write("<h2>Convert string to upper case</h2>");

document.write(str.toUpperCase());

document.write("<h2>Convert string to lower case</h2>");

document.write(str.toLowerCase());

document.write("<h2>Position of value in string at first occurance</h2>");

document.write(str.indexOf("s"));

document.write("<br/>");

document.write(str.indexOf("S"));

document.write("<h2>Position of value in string at last occurance</h2>");

document.write(str.lastIndexOf("s"));

document.write("<br/>");

document.write(str.lastIndexOf("S"));

document.write("<h2>Match value in string</h2>");

document.write(str.match("sample"));

document.write("<br/>");

document.write(str.match("Sample"));

document.write("<h2>Replace value in string</h2>");

document.write(str.replace("sample","test"));

document.write("<br/>");

document.write(str.replace("Sample","test"));

document.write("<h2>Substring value</h2>");

document.write(str.substring(2,10));

document.write("<br/>");

document.write(str.substring(0));

</script>

</head>

</html>

Output

Copy paste this code into html file and execute yourself in browser

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