February 5, 2016

String Functions in JavaScript

We have couple of functions to manipulate strings in JavaScript. Mostly commonly used functions are given below with example.

toUpperCase(): This function will change the case of a string to upper.

toLowerCase(): This function will change the case of a string to lower.

trim(): This function will remove any extra white space at the start and end of a string.

replace(): This function will replace any value in a string. It will take 2 parameters, old value and new value. It will basically search for old value in a string and perform the replacement. You can also pass regular expression as parameter instead of old value.

length: This is not a function but a property which will return the length of a string.

<!DOCTYPE html>
<html>
<head>
<title>JavaScript Tutorial</title> 	
</head>
<body>
<script type="text/javascript">
	
	var myString = "    JavaScript Tutorials for Beginners   ";

	document.write(myString.toUpperCase() + "<br>");

	document.write(myString.toLowerCase() + "<br>");
	
	document.write(myString.trim() + "<br>");

	var result = myString.replace("Beginners", "Advanced");
	document.write(result+ "<br>");

	document.write(myString.length);

</script>

</body>
</html>

You May Also Like: