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JavaScript sqrt() Method: Math Object

Description

The sqrt() method of math object is used to get the square root of a number.

Version

Implemented in JavaScript 1.0

Syntax

sqrt(x) 

Parameter

x: Refers a number.

js math object sqrt

Example:

In the following web document, sqrt() method returns the square root of various numbers.

<!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 Math object - sqrt() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript Math object : sqrt() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
document.write(Math.sqrt(0) + "<br />");
document.write(Math.sqrt(1) + "<br />");
document.write(Math.sqrt(81) + "<br />");
document.write(Math.sqrt(0.49) + "<br />");
x=36
document.write(Math.sqrt(x) + "<br />");
y=2
z=2
document.write(Math.sqrt(y+z) + "<br />");
document.write(Math.sqrt(-16));
//]]>
</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 sin() Method
Next: JavaScript tan() Method: Math Object

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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