w3resource

JavaScript length Property: String Object

Description

The length property is used get the length of a string object. The length is 0 for a null string.

Version

Implemented in JavaScript 1.0

Syntax

string.length 

Example:

The following web document demonstrates the length of a specified string.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript String object - length property example</title>
</head>
<body>
<h1 style="color: red">JavaScript String object : length property</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
var x="TextLength"
alert("The string length is " + x.length)
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also:

JavaScript Core objects, methods, properties.

Previous: JavaScript constructor Property: String Object
Next: JavaScript prototype Property: String Object

Test your Programming skills with w3resource's quiz.



JavaScript: Tips of the Day

Returns true if the given number is a power of 2, false otherwise

Example:

const tips_isPowerOfTwo = n => !!n && (n & (n - 1)) == 0;
console.log(tips_isPowerOfTwo(0)); 
console.log(tips_isPowerOfTwo(4));
console.log(tips_isPowerOfTwo(16));

Output:

false
true
true